Impact of endocrine-active compounds on adrenal androgen production in pigs during neonatal period.

This study investigated the impact of neonatal exposure to endocrine-active compounds (EACs): flutamide (antiandrogen), 4-tert-octylphenol (an estrogenic compound), and methoxychlor (an organochlorine insecticide exhibiting estrogenic, antiestrogenic and antiandrogenic activities) on androgen production within porcine adrenal glands. The expression of genes related to androgen synthesis and the level of androgen production were analyzed (i) in the adrenal glands of piglets exposed to EACs during the first 10 days of life (in vivo study), and (ii) in adrenal explants from sow-fed or formula-fed 10-day-old piglets incubated with EACs (ex vivo study). EACs affected the expression of genes linked to adrenal androgen biosynthesis. The prominent effect of methoxychlor on downregulation of StAR, CYP11A1 and HSD3B and upregulation of CYP17A1 and SULT2A1 were demonstrated. Furthermore, our study revealed divergent response to EACs between sow-fed and formula-fed piglets, suggesting that natural feeding may provide protection against adverse EACs effects, particularly those interfering with estrogens action.

Artificial Feeding Systems for Vector-Borne Disease Studies.

This review examines the advancements and methodologies of artificial feeding systems for the study of vector-borne diseases, offering a critical assessment of their development, advantages, and limitations relative to traditional live host models. It underscores the ethical considerations and practical benefits of such systems, including minimizing the use of live animals and enhancing experimental consistency. Various artificial feeding techniques are detailed, including membrane feeding, capillary feeding, and the utilization of engineered biocompatible materials, with their respective applications, efficacy, and the challenges encountered with their use also being outlined. This review also forecasts the integration of cutting-edge technologies like biomimicry, microfluidics, nanotechnology, and artificial intelligence to refine and expand the capabilities of artificial feeding systems. These innovations aim to more accurately simulate natural feeding conditions, thereby improving the reliability of studies on the transmission dynamics of vector-borne diseases. This comprehensive review serves as a foundational reference for researchers in the field, proposing a forward-looking perspective on the potential of artificial feeding systems to revolutionize vector-borne disease research.

Do human-wildlife interactions predict offspring hiding strategies in peri-urban fallow deer?

Human activities can induce significant behavioural changes in wildlife. Often explored through extractive interactions (e.g. hunting) that can favour certain behavioural traits, the implications of non-extractive ones, such as wildlife feeding, remain understudied. Research shows that people tend to favour bolder individuals within populations despite their dynamics and consequences being unclear. Using fallow deer in a peri-urban environment, we studied whether mothers that show reduced fear of humans and consistently approach them for food adopt weaker anti-predator strategies by selecting less concealed fawning bedsites closer to human hotspots. This would provide the advantage of additional feeding opportunities in comparison with shyer mothers while keeping their fawns close. Our dataset encompassed 281 capture events of 172 fawns from 110 mothers across 4 years. Surprisingly, mothers that regularly accepted food from humans selected more concealed bedsites farther from human hotspots, giving their offspring better protection while also benefitting from additional food during lactation. Our results show behavioural adaptations by a subset of females and, for the first time, link the tendency to approach humans and strategies to protect offspring. Given previous findings that these begging females also deliver heavier fawns at birth, our research further investigates human-wildlife feeding interactions and their behavioural implications.

Unveil the sugar diet and associated environmental compounds in the crop of the mosquito Culex pipiens.

Culex pipiens (Linnaeus, 1758) mosquitoes search plant sources of sugars to cope with the energetic demand of various physiological processes. The crop as part of the digestive system is devoted to the storage of sugar-based meal obtained from various nectars sources. The profiling of sugars and metabolites in the Culex pipiens' crop is scarce, and only few studies used Liquid Chromatography - Mass Spectrometry (LC-MS), which provides broad detection for biomonitoring environmental substances and even contaminants in the sugar diet of mosquitoes populations. Therefore, sugar and metabolite profiling were performed on crops obtained from mosquitoes exposed to plant nectar under laboratory or natural conditions by Ultra High-Performance LC-MS (UHPLC-MS). This method allowed us a precise quantitative and qualitative identification of sugar diet and associated environmental compounds in the crop of the mosquito C. pipiens. Under laboratory condition, mosquitoes were allowed to feed on either glucose solution, commercially-available flowers or field collected flowers. In addition, we collected mosquitoes from the field to compare those crop metabolomes with metabolome patterns occurring after nectar feeding in the lab. The sugar quantities and quality obtained from the crops of mosquitoes collected in the field were similar to those crops obtained from mosquitoes that fed on commercially-available flowers and from field collected flowers with a limit of detection of 10 µg/L for sucrose, glucose and sucrose. Next to sugar compounds, we identified 2 types of amino acids, 12 natural products, and 9 pesticides. Next to the diversity of sugar compounds, we could confirm that secondary metabolites and environmental pollutants are typically up taken from floral nectar sources by C. pipiens. The in-depth knowledge on mosquito-plant interactions may inspire the development and further optimization of mosquito trap systems and arboviral surveillance systems.

An optimized artificial blood feeding assay to study tick cuticle biology.

Ticks, ectoparasitic arachnids, are prominent disease vectors impacting both humans and animals. Their unique blood-feeding phase involves significant abdominal cuticle expansion, sharing certain similarities with insects. However, vital aspects, including the mechanisms of cuticle expansion, changes in cuticular protein composition, chitin synthesis, and cuticle function, remain poorly understood. Given that the cuticle expansion is crucial for complete engorgement of the ticks, addressing these knowledge gaps is essential. Traditional tick research involving live animal hosts has inherent limitations, such as ethical concerns and host response variability. Artificial membrane feeding systems provide an alternative approach, offering controlled experimental conditions and reduced ethical dilemmas. These systems enable precise monitoring of tick attachment, feeding parameters, and pathogen acquisition. Despite the existence of various methodologies for artificial tick-feeding systems, there is a pressing need to enhance their reproducibility and effectiveness. In this context, we introduce an improved tick-feeding system that incorporates adjustments related to factors like humidity, temperature, and blood-feeding duration. These refinements markedly boost tick engorgement rates, presenting a valuable tool for in-depth investigations into tick cuticle biology and facilitating studies on molting. This refined system allows for collecting feeding ticks at specific stages, supporting research on tick cuticle biology, and evaluating chemical agents' efficacy in the engorgement process.

Optimization of artificial membrane feeding system for lone star ticks, Amblyomma americanum (Acari: Ixodidae), and experimental infection with Rickettsia amblyommatis (Rickettsiales: Rickettsiaceae).

With the introduction of siliconized artificial membranes, various artificial feeding systems (AFS) for hard ticks (Ixodidae) have been developed over the last decades. Most AFS utilize similar core components but employ diverse approaches, materials, and experimental conditions. Published work describes different combinations of the core components without experimental optimizations for the artificial feeding of different tick species. Amblyomma americanum L., (Acari: Ixodidae) (lone star tick) is a known vector and reservoir for diverse tick-borne pathogens, such as Rickettsia amblyommatis and Ehrlichia chaffeensis. Ongoing environmental changes have supported the expansion of A. americanum into new habitats, contributing to increased tick-borne diseases in endemic areas. However, a significant knowledge gap exists in understanding the underlying mechanisms involved in A. americanum interactions with tick-borne pathogens. Here, we performed a systematic analysis and developed an optimized AFS for nymphal lone star ticks. Our results demonstrate that Goldbeater's membranes, rabbit hair, hair extract, and adult lone star ticks significantly improved the attachment rate of nymphal ticks, whereas tick frass and frass extract did not. With the optimized conditions, we achieved an attachment rate of 46 ±â€…3% and a success rate of 100% (i.e., one or more attached ticks) in each feeding experiment for nymphal lone star ticks. When fed on sheep blood spiked with R. amblyommatis, both nymphal and adult lone star ticks acquired and maintained R. amblyommatis, demonstrating the feasibility of studying A. americanum-pathogen interactions using AFS. Our study can serve as a roadmap to optimize and improve AFS for other medically relevant tick species.

Dimensão ética da alimentação e hidratação artificiais no doente terminal / Ethics, artificial nutrition, and hydration in terminal patients / Dimensión ética de la nutrición e hidratación artificial en los pacientes terminales

Resumo Dada a insuficiente evidência científica, decisões relativas à utilização de nutrição e hidratação artificiais em pacientes terminais configuram um importante dilema ético. Identifica-se um conflito entre as perspetivas de "tratar" e "cuidar", com variação quanto a sua utilização conforme o contexto legal e cultural de diferentes países. O intuito deste estudo é esclarecer se essa prática constitui uma medida de cuidado básico ou um tratamento fútil e desproporcionado. Procede-se a uma revisão das diretrizes e dos códigos deontológicos de diferentes países europeus. Em Portugal, na Itália e na Polônia, tal prática é vista como uma medida de cuidado básico; já em países como França, Inglaterra, Noruega, Irlanda, Alemanha, Finlândia, Holanda, Bélgica e Suíça, é considerada um tratamento fútil. Na Romênia, na Croácia e na Hungria, verifica-se um enquadramento ético e legal insuficiente. As diferenças de abordagem a doentes terminais podem ser reflexo das diferentes perspetivas culturais.

Abstract Given the lack of scientific evidence, decisions regarding the administration of artificial nutrition and hydration in terminally ill patients constitute an important ethical dilemma due to the conflict between "treat" and "care" perspectives and the varying usage depending on the legal and cultural background across countries. This study aims to explain whether this practice configures a basic care intervention or a futile medical treatment. Therefore, we review the national guidelines and codes of ethics from several European countries. Countries such as Portugal, Italy, and Poland view it as a basic care intervention, whereas France, England, Norway, Ireland, Germany, Finland, Netherlands, Belgium, and Switzerland, as a medical treatment. Moreover, countries such as Romania, Croatia, and Hungary lack such legal framework. The different approaches regarding the care of terminally ill patients can reflect differences on cultural perspectives.

Resumen Dada la insuficiente evidencia científica, las decisiones sobre el uso de la nutrición e hidratación artificiales en los pacientes terminales constituyen un importante dilema ético. Se identifica un conflicto entre las perspectivas de "tratar" y "cuidar", con variaciones en su uso según el contexto legal y cultural de los diferentes países. El objetivo de este estudio es dilucidar si esta práctica constituye una medida de atención básica o un tratamiento fútil y desproporcionado. Se realiza una revisión de las directrices y códigos deontológicos de diferentes países europeos. En Portugal, Italia y Polonia, se considera esta práctica como una medida de atención básica; mientras que en países como Francia, Inglaterra, Noruega, Irlanda, Alemania, Finlandia, Holanda, Bélgica y Suiza, se considera un tratamiento fútil. En Rumanía, Croacia y Hungría, el marco ético y jurídico es insuficiente. Las diferencias en el tratamiento de los pacientes terminales pueden reflejar diferentes perspectivas culturales.

Artificial feeding of Ornithodoros rostratus using a silicone membrane system.

The in vitro feeding of ticks facilitates the conduction of studies involving the intrinsic vector-pathogen relationship, susceptibility tests, and resistance to acaricides, in addition to mimicking the use of experimental hosts. The objective of this study was to establish an in vitro feeding system using silicone membranes to supply various diets to the species Ornithodoros rostratus. Each experimental group included 130 first-instar O. rostratus nymphs. The groups were divided according to the diet provided: citrated rabbit blood, citrated bovine blood, bovine blood with antibiotics, and defibrinated bovine blood. The control group was fed directly on rabbits. Ticks were weighed before and after the feeding and monitored individually according to their biological parameters. The results of the experiment demonstrated that the proposed system was efficient in terms of fixation stimulus and satisfactory in terms of tick engorgement, which would allow the maintenance of O. rostratus colonies by using artificial feeding through silicone membranes. All diets provided were efficient for the maintenance of colonies, but the ticks that received citrated rabbit blood displayed similar biological parameters to those observed under in vivo feeding conditions.

Comparative analysis of glass and Hemotek membrane feeding systems for malaria transmission research.

BACKGROUND: Glass membrane feeders are used in malaria research for artificial blood feeding. This study investigates the use of Hemotek membrane feeders as a standardized alternative feeding system. METHODS: Hemotek feeders were compared with glass feeders by assessing mosquito feeding rate, imbibed blood meal volume and Plasmodium falciparum infection intensity on mosquito guts. RESULTS: While mosquito feeding rate and blood meal volume were comparable between Hemotek and glass feeders, a loss in transmission was observed using the Hemotek feeder with a conventional collagen membrane. There was no difference in transmission between both feeders when Parafilm was used as the membrane. CONCLUSIONS: Hemotek feeders with a Parafilm membrane can be used as an alternative feeding system for malaria transmission research.

Interventions to support the re-establishment of breastfeeding and their application in humanitarian settings: A systematic review.

In 1998, the World Health Organisation (WHO) published general guidelines proposing essential measures to achieve relactation. Yet, increased knowledge about the practical set-up of relactation support interventions in different contexts is needed, especially in humanitarian settings, where nonbreastfed infants are particularly at risk. This study aimed to compile and assess the characteristics, outcomes and factors influencing the implementation of relactation support interventions reported since the latest WHO recommendations. We conducted a systematic review following Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines, undertaking a search from Medline, Embase, PubMed Central, Web of Science, Global Health and CINAHL electronic databases. Studies published in English and Spanish, reporting characteristics and outcomes of relactation support provided to non-(breastfeeding) BF mothers with infants aged less than 6 months were included. Data were analysed by narrative synthesis and the Johanna Briggs Institute Critical Appraisal Tools were used for quality assessment. Overall, 16 studies met the inclusion criteria. Most were observational and conducted in middle-income countries, only one focused on humanitarian settings. Studies reported inpatient and community-based interventions, which generally followed WHO recommendations for relactation. In 13 out of 16 studies, over 80% of mothers restarted BF after receiving relactation support. Enabling factors included younger infant age, shorter lactation gap, mother's strong motivation, family support, and continuous skilled support. Although current literature suggests that intensive relactation support can contribute to re-establish BF, its application and effectiveness in humanitarian settings remain uncertain. Further research is needed to explore the effectiveness, feasibility and acceptability of different approaches to relactation support, especially in humanitarian settings.

Artificial blood-feeding of phlebotomines (Diptera: Psychodidae: Phlebotominae): is it time to repurpose biological membranes in light of ethical concerns?

BACKGROUND: The aims of the present study were to evaluate and compare the efficacy of blood-feeding in phlebotomines through industrially processed membranes from the small intestine of pigs (used for the production of commercial sausages) and the skin of euthanized chicks. METHODS: Laboratory-bred Lutzomyia longipalpis and different field-caught phlebotomine species were subjected to the artificial feeding systems under similar conditions. Paired tests were performed using the control (skin from euthanized chicks) and test membranes (pig small intestine). The feeding rates were compared by paired t-test, and Pearson correlation was used to examine the relationship between the thickness of the membranes and feeding rate. RESULTS: The feeding rate was greater with the test membrane than with the control membrane for L. longipalpis (t-test, t = -3.3860, P = 0.0054) but not for the most frequent field-caught species, Nyssomyia antunesi (t-test, t = 0.7746, P = 0.4535). The average thicknesses of the control and test membranes were 184 ± 83 µm and 34 ± 12 µm, respectively (Mann-Whitney U-test, U = 0.00, Z = 2.8823, P = 0.0039); however, there was no correlation between feeding rate and membrane thickness. A moderate positive correlation was observed between the number of phlebotomines that fed and the total number of phlebotomines in the cage for each type of membrane and for each species. CONCLUSIONS: The test membrane is a viable alternative for the artificial blood-feeding of phlebotomines, and is thus a potential substitute for the skin of animals that are euthanized for this purpose. Feeding rate was independent of membrane thickness.

Dietary niche breadth influences the effects of urbanization on the gut microbiota of sympatric rodents.

Cities are among the most extreme forms of anthropogenic ecosystem modification, and urbanization processes exert profound effects on animal populations through multiple ecological pathways. Increased access to human-associated food items may alter species' foraging behavior and diet, in turn modifying the normal microbial community of the gastrointestinal tract (GIT), ultimately impacting their health. It is crucial we understand the role of dietary niche breadth and the resulting shift in the gut microbiota as urban animals navigate novel dietary resources. We combined stable isotope analysis of hair and microbiome analysis of four gut regions across the GIT to investigate the effects of urbanization on the diet and gut microbiota of two sympatric species of rodents with different dietary niches: the omnivorous large Japanese field mouse (Apodemus speciosus) and the relatively more herbivorous gray red-backed vole (Myodes rufocanus). Both species exhibited an expanded dietary niche width within the urban areas potentially attributable to novel anthropogenic foods and altered resource availability. We detected a dietary shift in which urban A. speciosus consumed more terrestrial animal protein and M. rufocanus more plant leaves and stems. Such changes in resource use may be associated with an altered gut microbial community structure. There was an increased abundance of the presumably probiotic Lactobacillus in the small intestine of urban A. speciosus and potentially pathogenic Helicobacter in the colon of M. rufocanus. Together, these results suggest that even taxonomically similar species may exhibit divergent responses to urbanization with consequences for the gut microbiota and broader ecological interactions.

Artificial selection in human-wildlife feeding interactions.

The artificial selection of traits in wildlife populations through hunting and fishing has been well documented. However, despite their rising popularity, the role that artificial selection may play in non-extractive wildlife activities, for example, recreational feeding activities, remains unknown. If only a subset of a population takes advantage of human-wildlife feeding interactions, and if this results in different fitness advantages for these individuals, then artificial selection may be at work. We have tested this hypothesis using a wild fallow deer population living at the edge of a capital city as our model population. In contrast to previous assumptions on the randomness of human-wildlife feeding interactions, we found that a limited non-random portion of an entire population is continuously engaging with people. We found that the willingness to beg for food from humans exists on a continuum of inter-individual repeatable behaviour; which ranges from risk-taking individuals repeatedly seeking and obtaining food, to shyer individuals avoiding human contact and not receiving food at all, despite all individuals having received equal exposure to human presence from birth and coexisting in the same herds together. Bolder individuals obtain significantly more food directly from humans, resulting in early interception of food offerings and preventing other individuals from obtaining supplemental feeding. Those females that beg consistently also produce significantly heavier fawns (300-500 g heavier), which may provide their offspring with a survival advantage. This indicates that these interactions result in disparity in diet and nutrition across the population, impacting associated physiology and reproduction, and may result in artificial selection of the begging behavioural trait. This is the first time that this consistent variation in behaviour and its potential link to artificial selection has been identified in a wildlife population and reveals new potential effects of human-wildlife feeding interactions in other species across both terrestrial and aquatic habitats.

"One of those things the student is left to do". Student midwives' experience of infant feeding education. A phenomenological study.

AIM/OBJECTIVE: To explore final year student midwives' experiences of breastfeeding education and clinical experience during their three year pre-registration midwifery degree course. BACKGROUND: Despite an increasing research base about what helps or hinders breastfeeding, there is a dramatic drop in breastfeeding prevalence within the first six weeks of birth. Breastfeeding support and education have been identified as influencing factors associated with breastfeeding prevalence, yet there is a paucity of evidence exploring infant feeding education for pre-registration student midwives. DESIGN: Qualitative data was gathered using semi-structured interviews with seventeen final year midwifery students in a Higher Education Institution in the North of England. METHODS: Interviews were audio recorded, transcribed verbatim, and analysed using thematic analysis. RESULTS: Three core themes were identified: The Mentor-Student Relationship, Midwives and student midwives' attitudes towards breastfeeding and Theory-Practice Disassociation. University-based input provided them with underpinning knowledge but provided little opportunity to develop skills. Attitudes towards breastfeeding were predominantly negative, and these negative descriptions were frequently linked by students to time constraints and workload pressures. The relationship between students and mentors had a direct impact on students' development of breastfeeding support skills and confidence: students who had mentors who were enthusiastic about their role in facilitating learning in clinical practice were confident in supporting women with infant feeding. However, many students described the hospital environment as too busy for infant feeding skills teaching and guidance. CONCLUSIONS: Although few participants were dissatisfied with how their pre-registration midwifery education prepared them for clinical practice in general, the majority would have liked more opportunities to support women with infant feeding in complex and challenging cases, both in University and in clinical practice. There is a need for midwifery students to be provided with a variety of educational experiences such as theoretical classroom-based learning, simulation-based learning, peer learning, clinical care practice and direct service user engagement. These learning experiences need to include artificial feeding and breastfeeding.

Breastfeeding initiation and duration and acute otitis media among children less than two years of age in Jordan: results from a case-control study.

BACKGROUND: Acute otitis media (AOM) is one of the most common infectious diseases that affects children. Breastfeeding has been linked to a lower risk of AOM in the first three years of childhood. The aim of this study was to identify the association between exclusive breastfeeding and the development of acute otitis media (AOM) and investigate the influence of breastfeeding duration on the presence of AOM. METHODS: In a retrospective case-control study, a sample of 98 children (cases) who were diagnosed with AOM and 98 children (controls) who were not diagnosed with AOM and were younger than two years old were selected from the Jordan University Hospital. Medical records were used to identify children with AOM. For both the case and control groups, the children's mothers completed a self-administered questionnaire about factors linked to the incidence of AOM.The type of feeding and the duration of breastfeeding were assessed using a validated questionnaire. RESULTS: The data indicated that among children who developed AOM, 23.5%were artificiallyfed, while 22.4% and 13.3% were exclusively breastfed for 3 months and 6 months, respectively. Approximately 70.7% of the children without AOM were exclusively breastfed for 6 months, compared with only 29.3% of the children without AOM who were exclusively breastfed for 3 months.Logistic regression revealed that nonexclusive breastfeeding, exclusive breastfeeding for 3 months, and exclusive breastfeeding for 6 months were protective factors against AOM (OR = 0.23, 0.18, and 0.25, respectively; P < 0.05). A short duration of exclusive breastfeeding was considered a risk factor for the development of AOM (OR = 1.7, P < 0.05). CONCLUSIONS: The escalation of AOM is tightly connected to the early introduction of formula feeding in the first six months of life. Breastfeeding had a protective impact on the occurrence of AOM. Understanding factors that are associated with the occurrence of AOM in children may support the role of public health institutions and primary health care in the prevention and reduction of AOM episodes and the need for national health strategies to promote breastfeeding.

A qualitative systematic review of family caregivers' experiences of artificial nutrition and hydration at home: A meta-ethnography.

BACKGROUND: Artificial nutrition and hydration (AN&H) may be provided to individuals in the home environment, and family caregivers are often involved in the management of this intervention. This experience can have multiple consequences for families. AIMS: The aim of this meta-ethnography is to explore and synthesize the personal experiences of family caregivers providing care to a person receiving home AN&H. METHODS & PROCEDURES: A comprehensive search of the literature was conducted without any time limitations applied. Seven stages of meta-ethnography were followed. Public and patient involvement was incorporated into the development of the line of argument synthesis in this review. This review is reported following the eMERGe guidelines and it was registered in PROSPERO. MAIN CONTRIBUTION: A total of 22 studies were included representing the experiences of 336 family caregivers. Two main themes emerged: (1) sink or swim, being thrown in at the deep end; and (2) professional support as a bedrock. The first theme represents the experiences from the very start of home AN&H when the family caregivers may be overwhelmed with the level of skills they have to acquire. With time, family caregivers perceived the benefits, but also the challenges, associated with managing home AN&H. If a person receiving home AN&H was able to continue with some oral intake, it had a positive impact on family caregivers' experiences. The second theme represents the influence of professional support on the lived experience of family caregivers managing home AN&H. This support should be individualized, comprehensive, and co-created with the family caregiver and the person receiving home AN&H. CONCLUSIONS & IMPLICATIONS: This review concluded that caring for a person receiving home AN&H can be very challenging for family caregivers. Family caregivers require personalized support from a multidisciplinary team of healthcare professionals to acquire skills, competence and confidence in this new role. Speech and language therapists are important members of this multidisciplinary team because they can facilitate a continuation of oral intake as appropriate. WHAT THIS PAPER ADDS: What is already known on the subject AN&H has an impact not only on the person receiving it but also on the wider family and family caregivers. Healthcare professionals have a role in supporting people living with AN&H. What this paper adds to existing knowledge This review presents a rigorous qualitative evidence synthesis that adheres fully to the eMERGe guidance for reporting of meta-ethnography. Within this meta-ethnography a current caregiver was consulted during the creation of the line of argument synthesis to provide a unique perspective to the review process. This review synthesized the current body of evidence that explores the lived experience of home AN&H (any type) for family caregivers, identifies where professional support is required and highlights current gaps. What are the potential or actual clinical implications of this work? Family caregivers require personalized support from a multidisciplinary team of healthcare professionals to adjust to living with home AN&H. This support assists people living with home AN&H in perceiving benefits and developing more positive experiences. Speech and language therapists are important members of the multidisciplinary team supporting individuals with home AN&H and their family caregivers as they can facilitate a continuation of oral intake as appropriate.

Changes in the Ixodes ricinus microbiome associated with artificial tick feeding.

Artificial tick feeding systems (ATFS) can be used to study tick biology and tick-pathogen interactions. Due to the long feeding duration of hard ticks, antibiotics are commonly added to the in vitro blood meal to prevent the blood from decaying. This may affect the ticks' microbiome, including mutualistic bacteria that play an important role in tick biology. This effect was examined by the consecutive feeding of Ixodes ricinus larvae, nymphs, and adults in vitro with and without the supplementation of gentamicin and in parallel on calves. DNA extracted from unfed females was analyzed by 16S rRNA sequencing. The abundance of Candidatus Midichloria mitochondrii, Rickettsia helvetica and Spiroplasma spp. was measured by qPCR in unfed larvae, nymphs, and adults. Larvae and nymphs fed on calves performed significantly better compared to both in vitro groups. Adults fed on blood supplemented with gentamicin and B vitamins had a higher detachment proportion and weight compared to the group fed with B vitamins but without gentamicin. The detachment proportion and weights of females did not differ significantly between ticks fed on calves and in vitro with gentamicin, but the fecundity was significantly higher in ticks fed on calves. 16S rRNA sequencing showed a higher microbiome species richness in ticks fed on calves compared to ticks fed in vitro. A shift in microbiome composition, with Ca. Midichloria mitochondrii as dominant species in females fed as juveniles on calves and R. helvetica as the most abundant species in females previously fed in vitro was observed. Females fed in vitro without gentamicin showed significant lower loads of Ca. M. mitochondrii compared to females fed in vitro with gentamicin and ticks fed on calves. Spiroplasma spp. were exclusively detected in female ticks fed on cattle by qPCR, but 16S rRNA sequencing results also showed a low abundance in in vitro females exposed to gentamicin. In conclusion, the employed feeding method and gentamicin supplementation affected the ticks' microbiome composition and fecundity. Since these changes may have an impact on tick biology and vector competence, they should be taken into account in studies employing ATFS.

Comprehensiveness of infant formula and bottle feeding resources: A review of information from Australian healthcare organisations.

The use of infant formula is widespread internationally. In Australia, 55% of infants receive formula before 6 months of age, with higher rates among disadvantaged communities. Infant formula use can contribute to childhood overweight and obesity, through formula composition and feeding behaviours, such as adding cereal to bottles and parental feeding style. While information abounds to promote and support breastfeeding, formula-feeding parents report a paucity of advice and support; many rely on formula packaging for information. This study systematically searched and reviewed online resources for infant formula and bottle feeding from Australian governments, health services, hospitals, and not-for-profit parenting organisations. A comprehensive search strategy located 74 current resources, mostly for parents. Researchers evaluated the resources against best practice criteria derived from Australian government and UNICEF guidelines on six topics. They assessed how comprehensively the resources addressed each topic and whether the resources provided all the information necessary for parents to understand each topic. The mean 'comprehensiveness' rating for topics across all resources was 54.36%. However, some topics were addressed more fully than others. Information on 'discussing infant formula with health workers' and on 'preparing infant formula' was more frequently accurate and comprehensive. However, there was much less comprehensive information on 'using infant formula', including amounts of formula to feed, use of bottle teats, appropriate bottle-feeding practice and responsiveness to infant satiety cues. Over half the resources were written at an acceptable reading level.

Expression Levels of Detoxification Enzyme Genes from Dendroctonus armandi (Coleoptera: Curculionidae) Fed on a Solid Diet Containing Pine Phloem and Terpenoids.

Bark beetles overcome the toxic terpenoids produced by pine trees by both detoxifying and converting them into a pheromone system. Detoxification enzymes such as cytochrome P450s, glutathione S-transferases, and carboxylesterases are involved in the ability of Dendroctonus armandi to adapt to its chemical environment. Ten genes from these three major classes of detoxification enzymes were selected to study how these enzymes help D. armandi to respond to the host defenses. The expression profile of these detoxification enzyme genes was observed in adult beetles after feeding on different types of diet. Significant differences were observed between two types of seminatural diet containing the phloem of pines, and a purely artificial diet containing five monoterpenes ((-)-α-pinene, (-)-ß-pinene, (+)-3-carene, (±)-limonene, and turpentine oil) also caused differential transcript levels in the detoxification enzyme genes. The results suggest that monoterpenes enter the beetles through different routes (i.e., respiratory and digestive systems) and cause the expression of different genes in response, which might be involved in pheromone metabolism. In addition, the xenobiotic metabolism in bark beetles should be considered as a system comprising multiple detoxifying enzymes.

Amamentação e o desenvolvimento pondo-estatural do lactente até o sexto mês de vida / Breastfeeding and the weight-height development of the infant until the sixth month of life

Objetivo: comparar o crescimento pondo-estatural dos lactentes aos seis meses de vida em aleitamento materno exclusivo e aleitamento complementar ou misto. Método: estudo transversal, com 38 mães e lactentes entre o quinto e o sexto mês de vida, cuja coleta de dados ocorreu em unidades de saúde de um município no Oeste do estado do Paraná, Brasil. Os dados foram analisados por estatística descritiva. Resultados: a prevalência do aleitamento materno exclusivo foi de 21% (n=8) da amostra. As variáveis antropométricas (peso, altura e perímetro cefálico - PC) dos lactentes em aleitamento materno exclusivo apresentaram médias inferiores àqueles em aleitamento materno predominante e/ou com uso de fórmula. Conclusão: o crescimento pondo-estatural dos lactentes aos seis meses de vida em aleitamento materno exclusivo e em aleitamento complementar ou misto estava dentro do esperado para a idade. Contudo, evidenciou-se baixa prevalência de aleitamento materno exclusivo. Palavras-chave: Aleitamento materno; Alimentação artificial; Desmame precoce; Crescimento; Lactente.

Objective: compare the weight-height growth of the infants at six months of life in exclusive breastfeeding and complementary or mixed breastfeeding. Method: transversal study, with 38 mothers and infants between the fifth and the sixty months of life, whose data collect occurred in primary health care units of a city in the West of the state of Paraná, Brazil. The data was analyzed by descriptive statistics. Results: the prevalence of exclusive breastfeeding was of 21% (n=8) of the sample. The anthropometrics variables (weight, height and head circumference - HC) of the infants in exclusive breastfeeding show lower averages to those in predominant breastfeeding and/or with use of formula. Conclusion: the weight-height growth of the infants at six months of life in exclusive breastfeeding and in complementary or mixed breastfeeding was inside of the expected for age. However, was evidenced low prevalence of exclusive breastfeeding.