RESUMO
This case report was prepared to provide information about Menacanthus pallidulus (Neumann, 1912), which was detected for the first time on a domestic chicken in Hatay province of Türkiye. Louse specimens collected from a chicken by a student were brought to Hatay Mustafa Kemal University Faculty of Veterinary Medicine, Department of Parasitology, and sent to Selçuk University Faculty of Veterinary Medicine, Department of Parasitology, for identification of species and microscopic examination revealed the presence of Menacanthus pallidulus (Neumann, 1912). Thus, with this study, the presence of M. pallidulus on domestic chickens was recorded for the first time in Türkiye.
Assuntos
Amblíceros , Galinhas , Infestações por Piolhos , Doenças das Aves Domésticas , Animais , Galinhas/parasitologia , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologia , Turquia , Doenças das Aves Domésticas/parasitologia , Amblíceros/classificação , Amblíceros/anatomia & histologia , Masculino , FemininoRESUMO
Pediculus humanus capitis (head louse), which causes pediculosis capitis, remains a global health concern. Plant products are efficient alternative pediculicides for treating the human ectoparasite P. h. capitis which is resistant to permethrin. The study evaluates the toxicity and mechanisms of 6-gingerol and Cymbopogon citratus leaf extract on P. h. capitis. Pediculus humanus capitis adult stages were exposed to three different dosages of 6-gingerol and C. citratus crude leaf extract on filter sheets for 5, 10, and 30 min, respectively. The biochemical approach was used to assess the activity of detoxifying enzymes including acetylcholinesterase (AChE), glutathione S-transferase (GST), and oxidase. Scanning electron microscope (SEM) was used to investigate the ultrastructure of the morphological body of lice. After 30 min, 6-gingerol and C. citratus leaf extract killed P. h. capitis completely. Bioassay periods significantly affected lice mortality (P < 0.05). The LC50 values for 6-gingerol and C. citratus extract were 1.79 µg/cm2 and 25.0 µg/cm2, respectively. 6-Gingerol and C. citratus leaf extract significantly lower AChE and GST activity (P < 0.05). Cymbopogon citratus also caused morphological ultrastructure changes in P. h. capitis, including an irregularly formed head, thorax, abdominal respiratory spiracles, and belly. 6-Gingerol and C. citratus leaf extracts could be used as an alternate pediculicide to decrease P. h. capitis populations.
Assuntos
Catecóis , Cymbopogon , Álcoois Graxos , Inseticidas , Pediculus , Extratos Vegetais , Animais , Pediculus/efeitos dos fármacos , Pediculus/ultraestrutura , Cymbopogon/química , Extratos Vegetais/farmacologia , Álcoois Graxos/farmacologia , Álcoois Graxos/toxicidade , Catecóis/farmacologia , Inseticidas/toxicidade , Folhas de Planta , Microscopia Eletrônica de Varredura/veterinária , Glutationa Transferase/metabolismo , Infestações por Piolhos/veterinária , Infestações por Piolhos/tratamento farmacológico , Infestações por Piolhos/parasitologiaRESUMO
Seal lice (Echinophthirius horridus) are bloodsucking ectoparasites of phocid seals and vectors of pathogens like the heartworm, Acanthocheilonema spirocauda. Grey and harbour seal populations are recovering in German waters and wildlife health surveillance is crucial for wildlife conservation. A new, high effort sampling protocol for seal lice was applied for grey and harbour seals along the German North- and Baltic Sea coast. Freshly dead seals were systematically sampled within a health monitoring of stranded seals over 12 months. Prevalence, intensity and distribution patterns of seal lice were analysed. 58% of harbour seals (n = 71) and 70% of grey seals (n = 10) were infected with seal lice. A majority of harbour seals displayed mild levels of infection, while three were moderately and two were severely infected. The head was the preferred predilection site, indicating that E. horridus prefers body areas with frequent access to atmospheric oxygen. Nits and different developmental stages were recorded in all age classes in grey and harbour seals in all seasons. For the first time, copulating specimens of E. horridus were recorded on a dead harbour seal, highlighting that E. horridus reproduces throughout the year on seals of all age classes in German waters.
Assuntos
Focas Verdadeiras , Animais , Prevalência , Focas Verdadeiras/parasitologia , Phoca/parasitologia , Feminino , Masculino , Infestações por Piolhos/epidemiologia , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologia , Alemanha/epidemiologia , FtirápterosRESUMO
BACKGROUND: The chicken body louse is an obligate ectoparasite of domestic chickens. Chicken body lice feed on feathers, and infestation with this louse is linked to decreases in egg production, hen weight, and feed conversion efficiency. However, it is unknown how chicken body lice impact egg-laying chickens in cage-free environments. Welfare and behavior metrics were collected from flocks of egg-laying chickens either infested with chicken body lice or left uninfested. METHODS: In two trials, two flocks of cage-free commercial egg-laying chickens were infested with chicken body lice or maintained as uninfested controls. At three timepoints, behavior and welfare of all chickens was measured. On-animal sensors were used to quantify pecking, preening, and dustbathing behavior. Other animal-based welfare metrics included recording comb wounds and skin lesions. RESULTS: Birds infested with chicken body lice exhibited significantly more preening behaviors than uninfested birds, even at low louse levels. Moderate or severe skin lesions were detected on birds that were moderately infested with chicken body lice while skin lesions were never detected on uninfested birds. CONCLUSIONS: The welfare of chickens was impacted by the chicken body louse, a chewing louse that primarily feather feeds. Evidence of skin lesions on infested birds suggests that lice may cause more damage to birds than previously thought, and further evaluation of louse economic damage is necessary.
Assuntos
Bem-Estar do Animal , Galinhas , Abrigo para Animais , Doenças das Aves Domésticas , Animais , Galinhas/parasitologia , Doenças das Aves Domésticas/parasitologia , Feminino , Comportamento Animal , Amblíceros/fisiologia , Plumas/parasitologia , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologiaRESUMO
Koi carp are globally known for their colors and cultural significance. The introduction of these fish to new environments poses a threat to local biodiversity, in addition to releasing parasites, such as argulid ectoparasites. This study presents a record of Argulus japonicus infecting carp in an artificial lake in Southern Brazil using morphological and molecular methods, with a 100% prevalence (n = 3) and a mean intensity of 21.6 parasites per host, distributed over the body surface. The invasion history of hosts in the study locality indicates that the introduction of A. japonicus occurred decades before its first formal record in Brazil.
Assuntos
Arguloida , Carpas , Doenças dos Peixes , Animais , Carpas/parasitologia , Doenças dos Peixes/parasitologia , Brasil/epidemiologia , Prevalência , Lagos/parasitologia , Ectoparasitoses/veterinária , Ectoparasitoses/parasitologia , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologiaRESUMO
This study reports for the first time the infestation of Cebidicola armatus in Brachyteles hypoxanthus. In total, 14 lice were recovered of an individual in Minas Gerais, Brazil. These were subjected to a microscopic analysis and the identification of C. armatus was carried out through its very characteristic morphology.
Assuntos
Infestações por Piolhos , Animais , Brasil , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologia , Masculino , Feminino , Doenças dos Macacos/parasitologia , Atelinae , Ftirápteros/classificaçãoRESUMO
Four genera and at least fifty species of chewing lice have been recorded infesting hummingbirds (Trochilidae). Here, we record for the first time, the genus Trochiliphagus in Brazil, as well as, a new host record for Trochiliphagus mellivorus Carriker, the fork-tailed woodnymph, Thalurania furcata.
Assuntos
Aves , Animais , Brasil , Amblíceros/classificação , Amblíceros/anatomia & histologia , Feminino , Doenças das Aves/parasitologia , Masculino , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologiaRESUMO
Birds have a diverse community of "permanent" arthropods that complete their entire life cycle on the body of the host. Because some of these arthropods are parasites that reduce host fitness, birds control them by grooming, which consists of preening with the beak and scratching with the feet. Although preening is the primary component of grooming, scratching is essential for controlling arthropods on the head and neck, which cannot be preened. Several unrelated groups of birds have evolved comb-like pectinate claws on the middle toenail of each foot. We tested the role of these claws in the control of arthropods by experimentally removing teeth from the claws of captive western cattle egrets (Bubulcus ibis) infested with chewing lice (Insecta: Phthiraptera), feather mites (Acari: Sarcoptiformes), and nasal mites (Acari: Mesostigmata). After a period of 4 mo, we compared the abundance of arthropods on experimental birds to that of control birds with intact teeth. We used video to quantify the grooming rates of the captive birds, which groomed twice as much as wild birds. Experimental and control birds did not differ significantly in grooming time. Both groups virtually eradicated the chewing lice, but not feather mites or nasal mites. We found no support for the hypothesis that pectinate claws increase the efficiency of arthropod control by grooming. Experiments with wild birds are needed to test the hypothesis further under conditions in which birds devote less time to grooming.
Assuntos
Ácaros e Carrapatos , Artrópodes , Doenças das Aves , Infestações por Piolhos , Ftirápteros , Animais , Bovinos , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologia , Asseio Animal , Doenças das Aves/parasitologia , Aves , Animais SelvagensRESUMO
Hylophthirus spinosus, new genus and new species (Phthiraptera: Anoplura: Enderleinellidae), is described from specimens collected from the particoloured flying squirrel, Hylopetes alboniger in Khammouane Province, Laos (Lao Peoples Democratic Republic). Both sexes of the new louse are illustrated with stacked microphotographs, scanning electron micrographs and line drawings. An updated morphological identification key to the six genera (Atopophthirus, Enderleinellus, Hylophthirus, Microphthirus, Phthirunculus and Werneckia) now recognised within the family Enderleinellidae is presented. The new genus is unique within the Enderleinellidae in having massive spines (modified setae) on some abdominal sternites, partially bulbous 5th antennal segments, mesothoracic spiracles borne on protuberances and the morphology of the genitalia of both sexes. Tables showing all genera of sucking lice that include species parasitising sciurids (squirrels, chipmunks, susliks and marmots), and all known species of enderleinellids, with their known host associations and geographical distributions are included and briefly discussed in relation to the new genus and species.
Assuntos
Anoplura , Infestações por Piolhos , Ftirápteros , Doenças dos Roedores , Feminino , Masculino , Animais , Anoplura/anatomia & histologia , Laos , Sciuridae , Infestações por Piolhos/veterináriaRESUMO
This study was carried out to detect the chewing lice species of domestic and wild birds in Türkiye, between the years of 2014-2021, and whether there is a correlation between the number of bird species and individuals and the prevalence, mean intensity and species of chewing lice. For this purpose, 206 bird samples as injured, or found dead on roads and gardens between these dates, in seventeen orders were examined for chewing lice. Of the 206 wild birds examined, 135 (65.53%) were infested with lice. A total of 73, of which 34 were Amblyceran and 39 were Ischnoceran chewing lice species, were identified. The genera Acidoproctus, Aegypoecus, Bonomiella, Esthiopterum, Gruimenopon, Heleonomus, Neopsittaconirmus, and the species Acidoproctus moschatae, Aegypoecus spp. (nymph), Amyrsidea minuta, Ardeicola maculatus, Ardeicola stellaris, Bonomiella columbae, Brueelia tasniemae, Colpocephalum nigrae, Colpocephalum percnopteri, Colpocephalum zerafae, Ciconiphilus pectiniventris, Esthiopterum gruis, Goniodes pavonis, Gruimenopon longum, Guimaraesiella amsel, Heleonomus macilentus, Kurodaia cryptostigmata, Kurodaia subpachygaster, Menacanthus kaddoui, Myrsidea isostoma, Neophilopterus tricolor, Neopsittaconirmus spp. (nymph), Pseudomenopon dolium, and Rallicola minutus are reported here for the first time. Based on statistical analysis, the host species and individual numbers are correlated with lice species numbers. It was also found that the host individual number is correlated with the mean intensity of the lice. Our results indicate that a large number of samples belonging to different host species are important in terms of data reliabilty.
Assuntos
Amblíceros , Doenças das Aves , Iscnóceros , Infestações por Piolhos , Aves Canoras , Humanos , Animais , Infestações por Piolhos/epidemiologia , Infestações por Piolhos/veterinária , Turquia , Doenças das Aves/epidemiologia , Animais SelvagensRESUMO
A total of 1,621 wild birds representing 34 species were examined for chewing lice in reed beds in southwestern Slovakia during the pre-breeding migration 2008-2009 and 2016-2019. A total of 377 (23.3%) birds representing 15 species were parasitized by 26 species of chewing lice of 12 genera. Dominant genera were Penenirmus (with dominance 32.6%) and Menacanthus (29.4%), followed by Brueelia (12.6%), Acronirmus (10.8%), Philopterus (7.7%), and Myrsidea (4.2%). We evaluated 33 host-louse associations including both 1) host-generalist, parasitizing more than one host species and host-specific lice, occurring only on a single host species, and 2) lice species with large range geographic distribution, reported across the range of the distribution of their hosts and lice species with only occasional records from a limited area within the range of their hosts. The Bearded Reedling, Panurus biarmicus (Linnaeus, 1758), was parasitized by two species of chewing lice, Menacanthus brelihi Balát, 1981 and Penenirmus visendus (Zlotorzycka, 1964), with conspicuously different prevalences (5.6% vs. 58.2%, respectively; n = 251). New material enabled us to redescribe both species of lice: the first one is resurrected from previous synonymy as a valid species. A fragment of the mitochondrial cytochrome oxidase I gene was sequenced from these two species in order to assess their relative phylogenetic position within their genera. Our study demonstrates the importance of an adequate identification of parasites, especially on rarely examined and endangered hosts.
Title: Mallophages de la Panure à moustaches (Panurus biarmicus) et diversité des associations mallophages-hôtes des oiseaux dans les roselières en Slovaquie. Abstract: Au total, 1 621 oiseaux sauvages représentant 34 espèces ont été examinés à la recherche de mallophages dans les roselières du sud-ouest de la Slovaquie au cours de la migration de pré-reproduction 20082009 et 20162019. Parmi ceux-ci, 377 oiseaux (23,3 %), représentant 15 espèces, étaient parasités par 26 espèces de mallophages de 12 genres. Les genres dominants étaient Penenirmus (avec une dominance de 32,6 %) et Menacanthus (29,4 %), suivis de Brueelia (12,6 %), Acronirmus (10,8 %), Philopterus (7,7 %) et Myrsidea (4,2 %). Nous avons évalué 33 associations mallophage-hôte comprenant à la fois 1) des espèces de mallophages généralistes, parasitant plus d'une espèce hôte, et des mallophages spécifiques, présents uniquement sur une seule espèce hôte et 2) des espèces de mallophages ayant une large répartition géographique, signalées à travers l'étendue de la répartition de leurs hôtes, et des espèces de mallophages avec seulement des observations occasionnelles dans une zone limitée à l'intérieur de l'aire de répartition de leurs hôtes. La Panure à moustaches, Panurus biarmicus (Linnaeus, 1758), était parasitée par deux espèces de mallophages, Menacanthus brelihi Balát, 1981 et Penenirmus visendus (Zlotorzycka, 1964), avec des prévalences nettement différentes (respectivement 5,6 % et 58,2 %, n = 251). Du nouveau matériel nous a permis de redécrire les deux espèces de mallophages, la première étant ressuscitée de la synonymie précédente en tant qu'espèce valide. Un fragment du gène mitochondrial de la cytochrome oxydase I a été séquencé à partir de ces deux espèces afin d'évaluer leur position phylogénétique relative au sein de leurs genres. Notre étude démontre l'importance d'une identification adéquate des parasites, en particulier sur les hôtes rarement examinés et menacés.
Assuntos
Amblíceros , Doenças das Aves , Iscnóceros , Infestações por Piolhos , Passeriformes , Animais , Infestações por Piolhos/epidemiologia , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologia , Filogenia , Eslováquia/epidemiologia , Doenças das Aves/epidemiologia , Doenças das Aves/parasitologia , Passeriformes/parasitologiaRESUMO
The human lice Pediculus humanus is distributed worldwide but, it thrives and flourishes under conflict situations where people are forced to live in crowded unhygienic conditions. Molecular methods were used to identify and screen human lice for the DNA of pathogens of public health importance in an area that has been under insurgency related to religious and political conflicts with tens of thousands of internally displaced people (IDP). DNA of Bartonella quintana, Acinetobacter baumannii and Acinetobacter haemolyticus was detected in 18.3%, 40.0% and 1.7%, respectively, of human lice collected from children in Maiduguri, Nigeria. More body lice than head lice were positive for pathogen's DNA (64.3% vs. 44.4%; χ2 = 1.3, p = 0.33), but the difference was not significant. Two lice samples were found to harbour mixed DNA of B. quintana and A. baumannii. Phylogenetic analysis of the cytochrome b (cytb) gene sequences of the positive lice specimens placed them into clades A and E. This is the first report on the molecular identification of human lice and the detection of the DNA of pathogens of public health importance in lice in Nigeria, West Africa. The findings of this study will assist policy makers and medical practitioners in formulating a holistic healthcare delivery to IDPs.
Assuntos
Acinetobacter baumannii , Acinetobacter , Bartonella quintana , Infestações por Piolhos , Pediculus , Humanos , Animais , Pediculus/genética , Acinetobacter baumannii/genética , Bartonella quintana/genética , Nigéria/epidemiologia , Filogenia , Infestações por Piolhos/epidemiologia , Infestações por Piolhos/veterinária , África Ocidental , DNARESUMO
A brood of laying hens infested with the lice Menacanthus cornutus (Phthiraptera: Menoponidae) evidenced itching, irritation, and damage to their zootechnical performance. A study was conducted to evaluate the zootechnical performance and infestation control using a 1% solution of fluralaner in a brood of white laying hens infested naturally with lice. The experiment was carried out using 10,560 naturally infested chickens divided into 2 groups: a treatment group of animals that received a 1% solution of fluralaner in drinking water, at a dose of 0.05 mL/kg of body weight, in 2 administrations, 7 d apart; and a control group of infested and untreated chickens. The groups of chickens were followed for 120 d to evaluate the score of infestation and zootechnical performance. It was observed that birds in the treatment group became free of lice infestation 7 d after the administration of the first dose of a 1% solution of fluralaner. For up to 120 d after the experiment was initiated, there was no evidence of subsequent lice infestation, while continued infestation with all life stages of lice (adults, young, or eggs) was evident in the untreated control group, remaining stable during all evaluations performed. The birds in the treatment group showed improved zootechnical performance when compared to a 9.94% egg production decrease in the control group. The feed conversion and egg mass data showed statistically significant differences between the 2 groups. This study allows us to conclude that treatment with a 1% solution of fluralaner effectively controlled Menacanthus cornutus lice infestation and promoted recovery of egg production in a brood of laying hens treated with the test formulation.
Assuntos
Água Potável , Infestações por Piolhos , Infestações por Ácaros , Doenças das Aves Domésticas , Animais , Feminino , Infestações por Ácaros/veterinária , Infestações por Piolhos/veterinária , Galinhas , Doenças das Aves Domésticas/tratamento farmacológico , ÓvuloRESUMO
The genus Neopsittaconirmus Conci, 1942 is a host-specific genus, found on both wild and captive parrots and love birds (order Psittaciformes). Two species of this genus: N. lybartota (Ansari, 1947) and N. chandabani (Ansari, 1947) have been previously reported from the Punjab province, Pakistan. We recorded N. lybartota from Psittacula eupatria nipalensis (n = 2), Psittacula krameri borealis (n = 13), and captive Psittacula krameri krameri (n = 4) with the mean intensity of 2.0 ± 1, 2.13 ± 0.35 and 2.25 ± 0.47, respectively; the prevalence of louse infestation was 62% in P. krameri borealis and 100% in P. krameri krameri and P. eupatria nipalensis. From this material, we redescribed its morphological variations in taxonomic features. Records on P. eupatria nipalensis and P. krameri krameri represent new host associations for this species of louse. We also present a new record of Neopsittaconirmus vendulae from a captive cockatiel, Nymphicus hollandicua (n = 3) in Pakistan, with mean intensity of 2.6 ± 0.66. Intraspecific variability of this species is described in detail, with special reference to the male and female terminalia, and male genitalia. We aimed to update and extend the fauna of chewing lice infesting birds of Pakistan. Previous records of Neopsittaconirmus on captive parrots around the world are summarized and discussed. Despite long-standing systematic veterinary care, some Neopsittaconirmus have cosmopolitan distribution and they are able to survive and successfully reproduce in captivity with their hosts, and even colonize novel hosts.
Assuntos
Doenças das Aves , Cacatuas , Iscnóceros , Infestações por Piolhos , Papagaios , Psittacula , Animais , Masculino , Feminino , Paquistão/epidemiologia , Infestações por Piolhos/veterinária , Doenças das Aves/epidemiologiaRESUMO
Recent studies of louse ectoparasites from mummies have developed robust data sets that allow a true epidemiological approach to the prehistory of louse parasitism. One epidemiological principle is that the binomial of overdispersion is normally negative, meaning that in a host population, parasites are aggregated in a few individuals. We demonstrate the overdispersion of lice in 3 different prehistoric communities that differ along 3 axes or variables: environmental setting, socioeconomic status, and cultural affiliation. Distinct cultural practices could have been involved in different patterns of louse infestation. Prevalence, intensity, and abundance of infestations exhibit statistically significant differences between the communities. We also find differences in prevalence between subadults and adults that contrasted by cultural affiliation and suggest conditions different from those seen today. We show that overall prevalence was affected primarily by ecological setting, not socioeconomic status nor cultural affiliation. These findings demonstrate that statistical analysis of archaeological data can reveal the states of infestation in past populations with lifestyles not seen in modern people. Our approach paves the way for future comparisons of subpopulations within archaeological communities.
Assuntos
Infestações por Piolhos , Pediculus , Adulto , Animais , Humanos , Peru/epidemiologia , Infestações por Piolhos/epidemiologia , Infestações por Piolhos/veterinária , RiosRESUMO
Sea lice are a key limitation to sustainable salmon aquaculture, and effective monitoring strategies are critical for the management of these parasites. Sentinel cages are an established means of assessing infestation pressure at fixed locations, but as smolts move through systems they will be exposed to varying lice densities. As a means of assessing infestation pressure along trajectories, we describe the development and application of towed sentinel cages (TSCs) in a Scottish sea loch containing salmonid aquaculture. Trial deployments took place over 3 yr (2016-2018), and levels of sea lice infestation were compared between methodologies. Oceanographic data was collected alongside TSCs to put the results into the environmental context that smolts and sea lice experienced during the tows. The sea lice infestation rates found from TSCs were comparable to those on contemporaneously deployed fixed sentinel cages. Thus, due to their practicability and consistency with other surveillance methods, TSCs could be used to improve the assessment of exposure risk along wild salmonid smolt migration trajectories, where these are known.
Assuntos
Copépodes , Infestações por Piolhos , Salmo salar , Animais , Infestações por Piolhos/veterinária , AquiculturaRESUMO
Unmanaged tick and sucking lice infestations negatively impact the health and production potential of cattle. Described herein are two non-interference dose confirmation studies evaluating the efficacy of a single administration of a new fixed-dose combination injectable (FDCI) endectocide consisting of 0.2 mg/kg doramectin + 6.0 mg/kg levamisole hydrochloride, against either laboratory-induced Rhipicephalus microplus infestations in Australia or naturally acquired sucking lice (Linognathus vituli) infestations in the US. This FDCI is available as Dectomax V® in Australia and New Zealand and as Valcor® in the United States. To evaluate therapeutic efficacy against R. microplus, 12 calves were each exposed to 10 infestations of â¼5000 larvae per infestation between Days -24 and -2. Calves were either treated on Day 0 with the FDCI or left untreated (control). Additional R. microplus infestations of â¼5000 larvae were conducted on Day 2 and then three times weekly to also evaluate persistent efficacy of the FDCI. Tick collections were conducted daily from Day -3. Group mean live tick counts, egg production, and egg viability were analyzed for significant differences between the two groups. To determine efficacy of the FDCI against lice, 24 cattle with active sucking lice infestations based on Day -7 counts were allocated to two groups and treated on Day 0 with either saline (control) or the FDCI. Lice counts were conducted weekly from Day 14 through 42 and again on Day 56. Mean group lice counts on each count day were compared between treatment groups. In the R. microplus study presented here, cattle in Queensland, Australia treated with the FDCI (Dectomax V®) showed > 90 % reduction in tick counts based on arithmetic means within 48 h of treatment when compared to untreated cattle, and counts were > 95 % reduced from post-treatment Day 5 through Day 30. In the sucking lice study conducted in the US, the FDCI (Valcor®) displayed 100 % efficacy against sucking lice infestations (L. vituli) from first count day (Day 14 post-treatment) through Day 35 and then 99.9 % efficacy through Day 56 post-treatment. No treatment-related adverse events were reported for cattle in either study. Using R. microplus and sucking lice as representative ectoparasites, these studies demonstrate the ectoparasite activity of doramectin is retained in the new FDCI.
Assuntos
Anoplura , Doenças dos Bovinos , Inseticidas , Infestações por Piolhos , Rhipicephalus , Infestações por Carrapato , Animais , Bovinos , Infestações por Piolhos/tratamento farmacológico , Infestações por Piolhos/veterinária , Levamisol/uso terapêutico , Inseticidas/uso terapêutico , Doenças dos Bovinos/tratamento farmacológico , Doenças dos Bovinos/parasitologia , Larva , Infestações por Carrapato/tratamento farmacológico , Infestações por Carrapato/veterinária , Infestações por Carrapato/parasitologiaRESUMO
Pheromone communication is central to the life history of insect parasites. Determining how pheromones affect parasite behavior can provide insights into host-parasite interactions and suggest novel avenues for parasite control. Lice infest thousands of bird and mammal species and feed on the host's feathers or blood. Despite the pervasiveness of lice in wild populations and the costs they exact on livestock and poultry industries, little is known about pheromone communication in this diverse group. Here, we test for pheromone communication in the wing lice (Columbicola columbae) of Rock Doves (Columba livia). Wing lice spend the majority of their lives on bird flight feathers where they hide from host preening by inserting their bodies between coarse feather barbs. To feed, wing lice must migrate to bird body regions where they consume the insulating barbs of contour feathers. We first show that wing lice readily form aggregations on flight feathers. Next, using a Y-tube olfactometer, we demonstrate that wing lice use pheromone communication to move toward groups of nearby conspecifics. This pheromone is likely an aggregation pheromone, as wing lice only produce the pheromone when placed on flight feathers. Finally, we found that when forced to choose between groups of male and female lice, male lice move toward male groups and females toward female groups, suggesting the use of multiple pheromones. Ongoing work aims to determine the chemical identity and function of these pheromones.
Assuntos
Anoplura , Doenças das Aves , Iscnóceros , Infestações por Piolhos , Parasitos , Ftirápteros , Animais , Masculino , Feminino , Infestações por Piolhos/veterinária , Infestações por Piolhos/parasitologia , Columbidae/parasitologia , Doenças das Aves/parasitologia , Interações Hospedeiro-Parasita , Comunicação , MamíferosRESUMO
A new subgenus and three new species of parasitic lice (Phthiraptera: Ischnocera) in the Oxylipeurus-complex are described and illustrated. Forcipurellus new subgenus is part of the genus Reticulipeurus Kéler, 1958, and only includes species parasitic on partridges of the genus Arborophila Hodgson, 1837. The new species are: Reticulipeurus (Forcipurellus) diki new species ex Arborophila rubrirostris (Salvadori, 1879); Reticulipeurus (Forcipurellus) bracatus new species ex Arborophila atrogularis (Blyth, 1849); Reticulipeurus (Forcipurellus) longistylus new species ex Arborophila rufogularis guttata Delacour & Jabouille, 1928 and two other host subspecies. In addition, we redescribe the species Reticulipeurus (Forcipurellus) formosanus (Uchida, 1917) ex Arborophila crudigularis (Swinhoe, 1864) and Reticulipeurus (Forcipurellus) nitzschi Kéler, 1958 ex Arborophila torqueola torqueola (Valenciennes, 1825) and Arborophila torqueola millardi (Baker, 1921). Also, we briefly discuss four additional species that could not be described based on the specimens examined. A key to identify all species in the subgenus Forcipurellus is provided, as well as an emendation to include Forcipurellus in a previously published key to the Oxylipeurus-complex.