Vaccine Efficacy of ALVAC-HIV and Bivalent Subtype C gp120-MF59 in Adults.

BACKGROUND: A safe, effective vaccine is essential to eradicating human immunodeficiency virus (HIV) infection. A canarypox-protein HIV vaccine regimen (ALVAC-HIV plus AIDSVAX B/E) showed modest efficacy in reducing infection in Thailand. An analogous regimen using HIV-1 subtype C virus showed potent humoral and cellular responses in a phase 1-2a trial in South Africa. Efficacy data and additional safety data were needed for this regimen in a larger population in South Africa. METHODS: In this phase 2b-3 trial, we randomly assigned 5404 adults without HIV-1 infection to receive the vaccine (2704 participants) or placebo (2700 participants). The vaccine regimen consisted of injections of ALVAC-HIV at months 0 and 1, followed by four booster injections of ALVAC-HIV plus bivalent subtype C gp120-MF59 adjuvant at months 3, 6, 12, and 18. The primary efficacy outcome was the occurrence of HIV-1 infection from randomization to 24 months. RESULTS: In January 2020, prespecified criteria for nonefficacy were met at an interim analysis; further vaccinations were subsequently halted. The median age of the trial participants was 24 years; 70% of the participants were women. The incidence of adverse events was similar in the vaccine and placebo groups. During the 24-month follow-up, HIV-1 infection was diagnosed in 138 participants in the vaccine group and in 133 in the placebo group (hazard ratio, 1.02; 95% confidence interval, 0.81 to 1.30; P = 0.84). CONCLUSIONS: The ALVAC-gp120 regimen did not prevent HIV-1 infection among participants in South Africa despite previous evidence of immunogenicity. (HVTN 702 ClinicalTrials.gov number, NCT02968849.).

Longitudinal predictors of post-exposure prophylaxis awareness among latino sexual minority men in South Florida.

Biomedical tools for HIV prevention such as post-exposure prophylaxis (PEP) continue to be underutilized by subgroups experiencing significant HIV inequities. Specifically, factors associated with both PEP awareness and uptake both cross-sectionally and longitudinally are under-researched, despite PEP being a part of the United States' Plan for Ending the HIV Epidemic. The current study examined longitudinal predictors of PEP awareness among Latino sexual minority men (LSMM) living in South Florida. This current study (N = 290) employed hierarchal linear modeling across three timepoints (baseline, 4-months, 8-months) to assess within-person and between-person effects over time for several psychosocial and structural factors. Most participants (67.5%) reported little to no awareness of PEP at baseline with general PEP awareness growing slightly across the study (60.5% reporting little to no awareness of PEP at 8 months). Results of the final conditional model suggest significant within-person effects of PrEP knowledge (p = 0.02) and PrEP self-efficacy (p < 0.001), as well as a significant positive between-person effect of PrEP knowledge (p < 0.01) on PEP awareness. Between-person HIV knowledge was also a significant predictor in this model (p = 0.01). This longitudinal analysis of LSMM's PEP awareness indicates that more must be done to increase PEP awareness among this subgroup. Future studies should explore how to build on existing interventions focused on HIV and PrEP knowledge and PrEP self-efficacy to incorporate information about PEP to increase the reach of this effective biomedical HIV prevention tool.

Towards Establishing Best Practice in the Analysis of Hydrogen and Deuterium by Atom Probe Tomography.

As hydrogen is touted as a key player in the decarbonization of modern society, it is critical to enable quantitative hydrogen (H) analysis at high spatial resolution and, if possible, at the atomic scale. H has a known deleterious impact on the mechanical properties (strength, ductility, toughness) of most materials that can hinder their use as part of the infrastructure of a hydrogen-based economy. Enabling H mapping including local hydrogen concentration analyses at specific microstructural features is essential for understanding the multiple ways that H affect the properties of materials including embrittlement mechanisms and their synergies. In addition, spatial mapping and quantification of hydrogen isotopes is essential to accurately predict tritium inventory of future fusion power plants thus ensuring their safe and efficient operation. Atom probe tomography (APT) has the intrinsic capability to detect H and deuterium (D), and in principle the capacity for performing quantitative mapping of H within a material's microstructure. Yet, the accuracy and precision of H analysis by APT remain affected by complex field evaporation behavior and the influence of residual hydrogen from the ultrahigh vacuum chamber that can obscure the signal of H from within the material. The present article reports a summary of discussions at a focused workshop held at the Max-Planck Institute for Sustainable Materials in April 2024. The workshop was organized to pave the way to establishing best practices in reporting APT data for the analysis of H. We first summarize the key aspects of the intricacies of H analysis by APT and then propose a path for better reporting of the relevant data to support interpretation of APT-based H analysis in materials.

Limited Outbreak of Highly Pathogenic Influenza A(H5N1) in Herring Gull Colony, Canada, 2022.

In summer 2022, highly pathogenic influenza A(H5N1) virus reached the herring gull (Larus argentatus subspecies smithsonianus) breeding colony on Kent Island, New Brunswick, Canada. Real-time monitoring revealed a self-limiting outbreak with low mortality. Proactive seabird surveillance is crucial for monitoring such limited outbreaks, protecting seabirds, and tracing zoonotic transmission routes.

The macroevolutionary dynamics of mammalian sexual size dimorphism.

Sexual size dimorphism (SSD) is a common phenomenon across the animal kingdom. Mammals are unusual in primarily displaying male-biased SSD, where males of a species are typically larger than females. The driving factors behind the evolution of this SSD have been much debated, with popular hypotheses invoking the influence of mating system and social organization via sexual selection, dietary niche divergence and broad-scale correlations with body size (Rensch's rule). Here, we investigate the macroevolutionary origins and maintenance of SSD among mammals, using phylogenetic general mixed linear models and a comprehensive global dataset to evaluate correlations of diet, body mass, seasonality, social organization and mating system with SSD type. We find that SSD as a whole is lost at a greater rate than it is gained, with female-biased SSD being particularly unstable. Non-monogamous mating systems, vertebrate prey consumption and temperature seasonality correlate with male-biased SSD, while polyandry correlates with female-biased SSD, and both types of SSD are positively correlated with body mass. This is in partial contrast to the predictions of Rensch's rule, which predicts that female-biased SSD would correlate negatively with body size. Taken together, our results highlight the importance of considering multiple ecological and social drivers when evaluating the macroevolutionary trajectory of sex differences in body size.

Structure-Reactivity Studies of 2-Sulfonylpyrimidines Allow Selective Protein Arylation.

Protein arylation has attracted much attention for developing new classes of bioconjugates with improved properties. Here, we have evaluated 2-sulfonylpyrimidines as covalent warheads for the mild, chemoselective, and metal free cysteine S-arylation. 2-Sulfonylpyrimidines react rapidly with cysteine, resulting in stable S-heteroarylated adducts at neutral pH. Fine tuning the heterocyclic core and exocyclic leaving group allowed predictable SNAr reactivity in vitro, covering >9 orders of magnitude. Finally, we achieved fast chemo- and regiospecific arylation of a mutant p53 protein and confirmed arylation sites by protein X-ray crystallography. Hence, we report the first example of a protein site specifically S-arylated with iodo-aromatic motifs. Overall, this study provides the most comprehensive structure-reactivity relationship to date on heteroaryl sulfones and highlights 2-sulfonylpyrimidine as a synthetically tractable and protein compatible covalent motif for targeting reactive cysteines, expanding the arsenal of tunable warheads for modern covalent ligand discovery.

Factors Associated with Antiretroviral Therapy Adherence Among a Community-Based Sample of Sexual Minority Older Adults with HIV.

Older sexual minorities (e.g., gay, bisexual) living with HIV are at risk for poor HIV outcomes due to their frequent experience with both psychosocial challenges and structural barriers to care. This study utilized a stochastic search variable selection (SVSS) approach to explore potential psychosocial and structural factors associated with HIV-related health outcomes among a community-based sample of older sexual minorities (N = 150) in South Florida, an U.S. HIV-epidemic epicenter. After SVSS, a forward entry regression approach suggested unstable housing, illicit substance use, current nicotine use, and depression were all associated with poorer ART adherence among older sexual minority adults living with HIV. No associations between potential correlates and biological measures of HIV disease severity were observed. Findings highlight a need to focus on multiple levels of intervention that target a combination of psychosocial and structural factors to improve HIV-care outcomes among older sexual minorities and achieve Ending the HIV Epidemic goals.

Minorías sexuales mayores (p.ej., gay, bisexual) que viven con VIH están en riesgo de resultados negativos de VIH debido a sus experiencias con desafíos psicosociales y barreras estructurales. Este estudio uso selección de variables de búsqueda estocástica (SVSS) para explorar factores psicosociales y estructurales asociadas con resultados de salud relacionado a VIH entre una muestra comunitaria de minorías sexuales mayores (N = 150) el la Sur de la Florida, un epicentro de la epidemia de VIH en EE. UU. Después de SVSS, una regresión de entrada directa sugirió que vivienda inestable, uso de sustancias ilícitas, consumo actual de nicotina, y depresión eran asociados con menos adherencia de terapias antirretroviral entre adultos mayores de minorías sexuales que viven con el VIH. No se encontraron asociaciones entre correlatos potenciales y medidas biológicas de VIH. Recomendaciones destacan una necesidad de concentrarse en múltiples niveles de intervención que apuntan una combinación de factores psicosociales y estructurales para mejorar resultados de VIH entre las minorías sexuales mayores y lograr las metas de Finalizando la Epidemia del VIH.

Differences in Habitual and Maximal Gait Velocity Across Age Groups: A Cross-Sectional Examination.

Prior work, primarily focusing on habitual gait velocity, has demonstrated a cost while walking when coupled with a cognitive task. The cost of dual-task walking is exacerbated with age and complexity of the cognitive or motor task. However, few studies have examined the dual-task cost associated with maximal gait velocity. Thus, this cross-sectional study examined age-related changes in dual-task (serial subtraction) walking at two velocities. Participants were classified by age: young-old (45-64 years), middle-old (65-79 years), and oldest-old (≥80 years). They completed single- and dual-task walking trials for each velocity: habitual (N = 217) and maximal (N = 194). While no significant Group × Condition interactions existed for habitual or maximal gait velocities, the main effects for both condition and age groups were significant (p < .01). Maximal dual-task cost (p = .01) was significantly greater in the oldest-old group. With age, both dual-task velocities decreased. Maximal dual-task cost was greatest for the oldest-old group.

A Cost-Effective Microfluidic Device to Teach the Principles of Electrophoresis and Electroosmosis.

Electrophoresis is integral to analytical and biochemistry experiences in undergraduate education; however, fundamental principles of the method are often taught in upper-level laboratories through hands-on experiences. A laboratory activity is reported that teaches the concepts of electrophoretic mobility and electroosmotic flow. A single reuseable instrument, called a mini-E, costs 37 USD and consists of a DC power supply, a voltmeter, platinum electrodes, and a chip cast in polydimethylsiloxane. This activity uses common reagents costing only 0.02 USD per student. Experiments are devised that allow students to investigate the properties of electrophoretic flow and electroosmotic flow by separating the two commonly used food dyeing agents Brilliant Blue FCF and Allura Red AC in vinegar and in a solution of ammonium hydroxide. A dark-purple mixture of these dyes is separated into red and blue bands that are easily visualized. The migration order of the dyes differs when the separation is performed under conditions of reversed polarity and suppressed electroosmotic flow (vinegar) compared to conditions of normal polarity and active electroosmotic flow (ammonium hydroxide). When delivered to chemistry majors, students had a significant gain in their ability to apply the concepts of electroosmosis and electrophoresis to predict analyte migration. Although this activity targets upper-level chemistry content, it can also be adapted for other laboratory experiences.

Infection Dynamics of Cotransmitted Reproductive Symbionts Are Mediated by Sex, Tissue, and Development.

One of the most prevalent intracellular infections on earth is with Wolbachia, a bacterium in the Rickettsiales that infects a range of insects, crustaceans, chelicerates, and nematodes. Wolbachia is maternally transmitted to offspring and has profound effects on the reproduction and physiology of its hosts, which can result in reproductive isolation, altered vectorial capacity, mitochondrial sweeps, and even host speciation. Some populations stably harbor multiple Wolbachia strains, which can further contribute to reproductive isolation and altered host physiology. However, almost nothing is known about the requirements for multiple intracellular microbes to be stably maintained across generations while they likely compete for space and resources. Here, we use a coinfection of two Wolbachia strains ("wHa" and "wNo") in Drosophila simulans to define the infection and transmission dynamics of an evolutionarily stable double infection. We find that a combination of sex, tissue, and host development contributes to the infection dynamics of the two microbes and that these infections exhibit a degree of niche partitioning across host tissues. wHa is present at a significantly higher titer than wNo in most tissues and developmental stages, but wNo is uniquely dominant in ovaries. Unexpectedly, the ratio of wHa to wNo in embryos does not reflect those observed in the ovaries, indicative of strain-specific transmission dynamics. Understanding how Wolbachia strains interact to establish and maintain stable infections has important implications for the development and effective implementation of Wolbachia-based vector biocontrol strategies, as well as more broadly defining how cooperation and conflict shape intracellular communities. IMPORTANCEWolbachia is a maternally transmitted intracellular bacterium that manipulates the reproduction and physiology of arthropods, resulting in drastic effects on the fitness, evolution, and even speciation of its hosts. Some hosts naturally harbor multiple strains of Wolbachia that are stably transmitted across generations, but almost nothing is known about the factors that limit or promote these coinfections, which can have profound effects on the host's biology and evolution and are under consideration as an insect-management tool. Here, we define the infection dynamics of a known stably transmitted double infection in Drosophila simulans with an eye toward understanding the patterns of infection that might facilitate compatibility between the two microbes. We find that a combination of sex, tissue, and development all contributes to infection dynamics of the coinfection.

Modulation of Metacognitive Confidence Judgments Through Provision of Performance Feedback in Moderate to Severe Traumatic Brain Injury.

OBJECTIVE: Traumatic brain injury (TBI) may result in metacognitive impairments. Enhancing memory in healthy adults can improve metacognitive accuracy, but it is unclear whether such interventions apply to individuals with TBI. This study examined the effects of manipulating target memory experiences on metacognitive accuracy in TBI. PARTICIPANTS: Fourteen community-dwelling adults with TBI and 17 healthy controls. MAIN MEASURES: Memory was manipulated through performance feedback (monetary, nonmonetary, or none) presented during a word-pair learning task. Recognition of the word pairs was assessed, and metacognition was evaluated by retrospective confidence judgments. RESULTS: Both groups demonstrated greater recognition performance for items learned with nonmonetary feedback. Healthy individuals demonstrated improved metacognitive accuracy for items learned with nonmonetary feedback, but this effect was not seen in individuals with TBI. A notable (but statistically nonsignificant) effect was observed whereby adults with TBI overestimated performance for items learned with monetary feedback compared with other feedback conditions. CONCLUSION: Provision of feedback during learning enhances recognition performance. However, target memory experiences may be utilized differently after injury to facilitate confidence judgments. In addition, the type of feedback provided may have different effects on metacognitive accuracy. These results have implications for rehabilitative efforts in the area of memory and metacognition after injury.

Sit-to-Stand Power Across the Lifespan: A Cross-Sectional Analysis.

Lower-body power measured by a linear position transducer during the sit-to-stand (STS) movement declines with age and may be a predictor of physical disability in older adults. The purpose of this study was to establish normative data for STS power across the lifespan and to determine if differences exist between age cohorts, sexes, and age cohort-sex subgroups. Adults (N = 557) aged 18-89 were divided into five age cohorts and performed the STS connected to a linear position transducer, which calculated power and velocity during the movement. Significantly lower (p < .01) velocity was observed in a younger age cohort in females than males, whereas males saw a significant average power decrement (p < .01) in a younger age cohort than females. STS power norms give clinicians a metric predicting physical disability and may be of particular interest to males as their power production begins to decline at an earlier age.

Effectiveness of SARS-CoV-2 Vaccines for Short- and Long-Term Immunity: A General Overview for the Pandemic Contrast.

BACKGROUND: The recent COVID-19 pandemic produced a significant increase in cases and an emergency state was induced worldwide. The current knowledge about the COVID-19 disease concerning diagnoses, patient tracking, the treatment protocol, and vaccines provides a consistent contribution for the primary prevention of the viral infection and decreasing the severity of the SARS-CoV-2 disease. The aim of the present investigation was to produce a general overview about the current findings for the COVID-19 disease, SARS-CoV-2 interaction mechanisms with the host, therapies and vaccines' immunization findings. METHODS: A literature overview was produced in order to evaluate the state-of-art in SARS-CoV-2 diagnoses, prognoses, therapies, and prevention. RESULTS: Concerning to the interaction mechanisms with the host, the virus binds to target with its Spike proteins on its surface and uses it as an anchor. The Spike protein targets the ACE2 cell receptor and enters into the cells by using a special enzyme (TMPRSS2). Once the virion is quietly accommodated, it releases its RNA. Proteins and RNA are used in the Golgi apparatus to produce more viruses that are released. Concerning the therapies, different protocols have been developed in observance of the disease severity and comorbidity with a consistent reduction in the mortality rate. Currently, different vaccines are currently in phase IV but a remarkable difference in efficiency has been detected concerning the more recent SARS-CoV-2 variants. CONCLUSIONS: Among the many questions in this pandemic state, the one that recurs most is knowing why some people become more seriously ill than others who instead contract the infection as if it was a trivial flu. More studies are necessary to investigate the efficiency of the treatment protocols and vaccines for the more recent detected SARS-CoV-2 variant.

Benefits and Implications of Resveratrol Supplementation on Microbiota Modulations: A Systematic Review of the Literature.

Resveratrol is a polyphenol that has been shown to possess many applications in different fields of medicine. This systematic review has drawn attention to the axis between resveratrol and human microbiota, which plays a key role in maintaining an adequate immune response that can lead to different diseases when compromised. Resveratrol can also be an asset in new technologies, such as gene therapy. PubMed, Cochrane Library, Scopus, Web of Science, and Google Scholar were searched to find papers that matched our topic dating from 1 January 2017 up to 18 January 2022, with English-language restriction using the following Boolean keywords: ("resveratrol" AND "microbio*"). Eighteen studies were included as relevant papers matching the purpose of our investigation. Immune response, prevention of thrombotic complications, microbiota, gene therapy, and bone regeneration were retrieved as the main topics. The analyzed studies mostly involved resveratrol supplementation and its effects on human microbiota by trials in vitro, in vivo, and ex vivo. The beneficial activity of resveratrol is evident by analyzing the changes in the host's genetic expression and the gastrointestinal microbial community with its administration. The possibility of identifying individual microbial families may allow to tailor therapeutic plans with targeted polyphenolic diets when associated with microbial dysbiosis, such as inflammatory diseases of the gastrointestinal tract, degenerative diseases, tumors, obesity, diabetes, bone tissue regeneration, and metabolic syndrome.

Echinococcus multilocularis infection in a red fox (Vulpes vulpes) on Prince Edward Island, Canada.

Objective: Molecular identification of small cestodes, morphologically consistent with Echinococcus multilocularis, recovered at necropsy from the gastrointestinal tract contents of a red fox, was accomplished by PCR using published species-specific n ad1 primers and methods. Animal: Red fox (Vulpes vulpes). Procedure: Small cestodes recovered from intestinal contents of a red fox trapped on Prince Edward Island in December 2020 (frozen at -20°C before being processed for parasite recovery in June 2021) were morphologically identified. Species identity confirmation and haplotyping of the cestodes were done via PCR and DNA sequencing of the n ad1, nad2, and cob genes. Results: Small cestodes morphologically consistent with E. multilocularis were detected in the gastrointestinal tract contents of a red fox trapped near Montague, PEI. The species identity was confirmed via PCR. Haplotyping revealed that they were of the European E1 haplotype. Conclusion: In Canada, E. multilocularis has been reported as far east as Québec, with most reports being in central and western provinces and territories. This is the first report of E. multilocularis infection in a canid host east of Ontario, Canada and illustrates the need for regular wildlife disease surveillance to enhance our understanding of emerging pathogens of veterinary and medical importance. Clinical Relevance: Echinococcus multilocularis is a highly pathogenic zoonotic cestode from the family Taeniidae that can cause alveolar echinococcosis (AE) when rodents, dogs, horses, pigs, non-human primates, or humans ingest its eggs. Alveolar echinococcosis is challenging to treat, and survival rates for untreated individuals are low.

Objectif: L'identification moléculaire de petits cestodes, morphologiquement compatibles avec Echinococcus multilocularis, récupérés à l'autopsie du contenu du tractus gastro-intestinal d'un renard roux, a été réalisée par PCR à l'aide d'amorces nad1 spécifiques à l'espèce et de méthodes publiées. Animal: Renard roux (Vulpes vulpes). Procédure: De petits cestodes récupérés du contenu intestinal d'un renard roux piégé à l'Île-du-Prince-Édouard en décembre 2020 (congelés à −20 °C avant d'être traités pour la récupération des parasites en juin 2021) ont été morphologiquement identifiés. La confirmation de l'identité des espèces et l'haplotypage des cestodes ont été effectués par PCR et séquençage de l'ADN des gènes nad1, nad2 et cob. Résultats: De petits cestodes morphologiquement compatibles avec E. multilocularis ont été détectés dans le contenu du tractus gastro-intestinal d'un renard roux piégé près de Montague, Î.-P.-É. L'identité de l'espèce a été confirmée par PCR. L'haplotypage a révélé qu'ils étaient de l'haplotype européen E1. Conclusion: Au Canada, E. multilocularis a été signalé aussi loin à l'est que le Québec, la plupart des signalements ayant été rapportés dans les provinces et territoires du centre et de l'ouest. Il s'agit du premier rapport d'infection à E. multilocularis chez un canidé hôte à l'est de l'Ontario, au Canada, et illustre la nécessité d'une surveillance régulière des maladies de la faune pour améliorer notre compréhension des agents pathogènes émergents d'importance vétérinaire et médicale. Pertinence clinique: Echinococcus multilocularis est un cestode zoonotique hautement pathogène de la famille des Taeniidae qui peut provoquer une échinococcose alvéolaire (EA) lorsque des rongeurs, des chiens, des chevaux, des porcs, des primates non humains ou des humains ingèrent ses oeufs. L'échinococcose alvéolaire est difficile à traiter et les taux de survie des personnes non traitées sont faibles.(Traduit par Dr Serge Messier).

First report of Angiostrongylus vasorum (French heartworm) in red foxes (Vulpes vulpes) on Prince Edward Island.

Objective: To identify first-stage nematode larvae (L1) recovered from a red fox scat sample and adult female worms recovered from 2 red fox lungs at necropsy, using published molecular methods to confirm a morphological diagnosis of Angiostrongylus vasorum (French heartworm). Animal: Red fox (Vulpes vulpes). Procedure: Nematode larvae recovered from a Baermann examination survey of wild canid scats (n = 101) conducted from January 2017 to August 2020, were identified by size and morphology and subjected to PCR and DNA sequencing of the small subunit (SSU) rRNA gene, the large subunit (LSU) rRNA gene, or the second internal transcribed spacer (ITS2). In addition, these techniques were applied to adult female worms recovered from the heart/lungs of 2 red foxes (obtained from PEI trappers and stored frozen at -20°C since December of 2018 and 2020). Results: Size and morphology of L1 recovered by Baermann examination from a wild canid scat sample (presumed to be red fox) collected near Montague, PEI and adult female worms recovered at necropsy from 2 red fox carcasses were identified as A. vasorum. Molecular analysis confirmed the larvae and adult worms were A. vasorum. Conclusion: These findings indicated that A. vasorum has become endemic in the red fox population on PEI. Clinical relevance: Angiostrongylus vasorum infection is potentially fatal in dogs. Veterinarians and regional diagnostic laboratories in the Maritime provinces should consider the possibility of A. vasorum infection in dogs with clinical signs of cardiopulmonary and/or central nervous system disease or bleeding disorders.

Objectif: Identifier les larves de nématodes de premier stade (L1) récupérées à partir d'un échantillon d'excréments de renard roux et les vers femelles adultes récupérés à partir de deux poumons de renard roux à l'autopsie, en utilisant des méthodes moléculaires publiées pour confirmer un diagnostic morphologique d'Angiostrongylus vasorum (ver du coeur français). Animal: Renard roux (Vulpis vulpis). Procédure: Les larves de nématodes récupérées lors d'une enquête sur des excréments de canidés sauvages (n = 101) par examen Baermann menée de janvier 2017 à août 2020, ont été identifiées par taille et morphologie et soumises à la PCR et au séquençage de DNA de la petite sous-unité (SSU) du gène de rRNA, de la grande sous-unité (LSU) du gène de rRNA ou du deuxième espaceur interne transcrit (ITS2). De plus, ces techniques ont été appliquées à des vers femelles adultes récupérés du coeur/poumons de deux renards roux (obtenus auprès de trappeurs de l'Î.-P.-É. et conservés congelés à −20 °C depuis décembre 2018 et 2020). Résultats: La taille et la morphologie de L1 récupérées par examen Baermann à partir d'un échantillon d'excréments de canidés sauvages (présumé être du renard roux) prélevé près de Montague, Î.-P.-É. et des vers adultes femelles récupérés des carcasses lors de la nécropsie de deux renards roux ont été identifiés comme étant A. vasorum. L'analyse moléculaire a confirmé que les larves et les vers adultes étaient A. vasorum. Conclusion: Ces résultats indiquent qu'A. vasorum est devenu endémique dans la population de renards roux de l'Î.-P.-É. Pertinence clinique: L'infection à A. vasorum est potentiellement mortelle chez le chien. Les vétérinaires et les laboratoires de diagnostic régionaux des provinces maritimes devraient envisager la possibilité d'une infection à A. vasorum chez les chiens présentant des signes cliniques de maladie cardio-pulmonaire et/ou du système nerveux central ou de troubles de la coagulation.(Traduit par Dr Serge Messier).

Copper@ZIF-8 Core-Shell Nanowires for Reusable Antimicrobial Face Masks.

SARS-CoV-2 and other respiratory viruses spread via aerosols generated by infected people. Face masks can limit transmission. However, widespread use of disposable masks consumes tremendous resources and generates waste. Here, a novel material for treating blown polypropylene filtration media used in medical-grade masks to impart antimicrobial activity is reported. To produce thin copper@ZIF-8 core-shell nanowires (Cu@ZIF-8 NWs), Cu NWs are stabilized using a pluronic F-127 block copolymer, followed by growth of ZIF-8 to obtain uniform core-shell structures. The Cu@ZIF-8 NWs are applied to filtration media by dip coating. Aerosol filtration efficiency decreases upon exposure to ethanol (solvent for dip-coating), but increases with addition of Cu@ZIF-8 NWs. Cu@ZIF-8 NWs shows enhanced antibacterial activity, compared to Cu NWs or ZIF-8 alone, against Streptococcus mutans and Escherichia coli. Antiviral activity against SARS-CoV-2 is assayed using virus-infected Vero E6 cells, demonstrating 55% inhibition of virus replication after 48 h by 1 µg of Cu@ZIF-8 NWs per well. Cu@ZIF-8 NWs' cytotoxicity is tested against four cell lines, and their effect on inflammatory response in A549 cells is examined, demonstrating good biocompatibility. This low-cost, scalable synthesis and straightforward deposition of Cu@ZIF-8 NWs onto filter media has great potential to reduce disease transmission, resource consumption, and environmental impact of waste.

Searching for Gravitational Waves from Cosmological Phase Transitions with the NANOGrav 12.5-Year Dataset.

We search for a first-order phase transition gravitational wave signal in 45 pulsars from the NANOGrav 12.5-year dataset. We find that the data can be modeled in terms of a strong first order phase transition taking place at temperatures below the electroweak scale. However, we do not observe any strong preference for a phase-transition interpretation of the signal over the standard astrophysical interpretation in terms of supermassive black hole mergers; but we expect to gain additional discriminating power with future datasets, improving the signal to noise ratio and extending the sensitivity window to lower frequencies. An interesting open question is how well gravitational wave observatories could separate such signals.

Implementing supportive exercise interventions in the colorectal cancer care pathway: a process evaluation of the PREPARE-ABC randomised controlled trial.

BACKGROUND: A colorectal resection is standard treatment for patients with colorectal cancer (CRC). However, the procedure results in significant post-operative mortality and reduced quality of life. Maximising pre-operative cardiopulmonary fitness could improve post-surgical outcomes. PREPARE-ABC is a multi-centre, three-armed, randomised controlled trial investigating the effects of exercise interventions, with motivational support on short and longer-term recovery outcomes in CRC patients undergoing major lower-gastrointestinal surgery. The trial included an internal pilot phase with parallel process evaluation. The aim of the process evaluation was to optimise intervention implementation for the main trial. METHODS: Mixed methods process evaluation conducted in 14 UK hospitals between November 2016 and March 2018. Data included a site profile questionnaire and telephone scoping interview with hospital staff, 34 qualitative observations of standard care and 14 observations of intervention delivery, 13 semi-structured interviews with healthcare professionals (HCPs) and 28 semi-structured interviews with patients. Data analysis focused on describing intervention delivery within each arm, assessing fidelity, acceptability and how variation in delivery was linked to contextual characteristics. RESULTS: Standard care exercise advice was typically limited to maintaining current activity levels, and with lead-in time to surgery affecting whether any exercise advice was provided. Variation in HCP capacity affected the ability of colorectal units to deploy staff to deliver the intervention. Patients' exercise history and motivation prior to surgery influenced HCP perceptions and delivery of the motivational components. Observations indicated a high level of fidelity to delivery of the exercise interventions. All but one of the 28 interviewed patients reported increasing exercise levels as a result of receiving the intervention, with most finding them motivational and greatly valuing the enhanced level of social support (versus standard care) provided by staff. CONCLUSION: Hospital-supervised and home-based exercise interventions were highly acceptable for most patients undergoing surgery for CRC. Delivery of pre- and post-operative exercise within the CRC care pathway is feasible but systematic planning of capacity and resources is required to optimise implementation.

Efficacy-based and normative interventions for facilitating the diffusion of conservation behavior through social networks.

Research suggests that encouraging motivated residents to reach out to others in their social network is an effective strategy for increasing the scale and speed of conservation action adoption. However, little is known about how to effectively encourage large numbers of residents to reach out to others about conservation causes. We examined the influence of normative and efficacy-based messaging at motivating residents to engage in and to encourage others to participate in native plant gardening in their community. To do so, we conducted a field experiment with messages on mailings and tracked native plant vouchers used. Efficacy messages tended to be more effective than normative messages at increasing residents' willingness to reach out to others to encourage conservation action, as indicated by a several percentage point increase in native plant voucher use by residents' friends and neighbors. Messages sometimes had different impacts on residents based on past behaviors and perceptions related to native plant gardening. Among these subgroups, efficacy and combined efficacy and norm messages most effectively encouraged individual and collective actions, as indicated by increased voucher usage. Our findings suggest that interventions that build residents' efficacy for engaging in a conservation behavior and for reaching out to others may be a promising path forward for outreach. However, given our results were significant at a false discovery rate cutoff of 0.25 but not 0.05, more experimental trials are needed to determine the robustness of these trends.

Intervenciones Normativas y Basadas en la Eficiencia para Facilitar la Difusión del Comportamiento de Conservación por Medio de las Redes Sociales Resumen Las investigaciones sugieren que alentar a los residentes motivados para que se comuniquen con otros en sus redes sociales es una estrategia efectiva para incrementar la escala y velocidad de la adopción de las acciones de conservación. Sin embargo, se sabe poco sobre cómo alentar de manera efectiva a un gran número de residentes para que hablen con otros sobre las causas de la conservación. Examinamos la influencia de la mensajería normativa y basada en la eficiencia sobre la motivación de los residentes para ellos mismos participar y alentar a otros a participar en la jardinería de plantas nativas dentro de su comunidad. Para lograr esto, realizamos un experimento de campo con mensajes en los envíos y rastreo de los vales usados para plantas nativas. Los mensajes de eficiencia tendieron a ser más efectivos que los mensajes normativos para incrementar la voluntad de los residentes para alentar a otros a tomar acciones de conservación, como lo indicó el incremento de varios puntos porcentuales en el uso de vales para plantas nativas de los amigos y vecinos de los residentes. Los mensajes a veces tuvieron un impacto diferente sobre los residentes con base en los comportamientos pasados y las percepciones relacionadas con la jardinería de plantas nativas. Entre estos subgrupos, la eficiencia, la eficiencia combinada y los mensajes normativos fueron los factores que alentaron de manera más efectiva las acciones individuales y colectivas, como lo indicó el incremento en el uso de vales. Nuestros hallazgos sugieren que las intervenciones que construyen la eficiencia de los residentes para participar en el comportamiento de conservación y para comunicarse con otros sobre éstas puede ser un camino prometedor para la divulgación. Sin embargo, ya que nuestros resultados fueron significativos a una tasa límite de descubrimientos falsos de 0.25 y no 0.05, se requieren más pruebas experimentales para determinar la fortaleza de estas tendencias.