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Veterinary Parasitology

Jianguo Zhao, Andrew R Williams, Tina Vicky Alstrup Hansen, Stig M Thamsborg, Jianping Cai, Shuaibao Song, Gang Chen, Ming Kang, Zhuangzhi Zhang, Qun Liu, Qian Han
In vitro methods have been developed for the detection of anthelmintic resistance in a range of nematode species. However, the life cycle of Ascaris suum renders the commonly used egg hatch assay and larval development assay unusable. In this study we developed a combined multi-well culture and agar gel larval migration assay to test the effect of benzimidazole and tetrahydropyrimidin/imidazothiazole anthelmintics against nine isolates of A. suum collected from locations in China and Denmark. Drugs tested were thiabendazole, fenbendazole, mebendazole, levamisole, and pyrantel...
March 18, 2017: Veterinary Parasitology
A Escamilla, R Pérez-Caballero, R Zafra, M J Bautista, I L Pacheco, M T Ruiz, M S Martínez-Cruz, A Martínez-Moreno, V Molina-Hernández, J Pérez
Several immunomodulatory properties have been described in Fasciola hepatica infections. Apoptosis has been shown to be an effective mechanism to avoid the immune response in helminth infections. The aim of the present work was to study apoptosis in peritoneal leucocytes of sheep experimentally infected with F. hepatica during the early stages of infection. Five groups (n=5) of sheep were used. Groups 2-5 were orally infected with 200 metacercariae (mc) and sacrificed at 1, 3, 9 and 18days post-infection (dpi), respectively...
March 18, 2017: Veterinary Parasitology
Ildenice Nogueira Monteiro, Odair Dos Santos Monteiro, Lívio Martins Costa-Junior, Aldilene da Silva Lima, Eloisa Helena de Aguiar Andrade, José Guilherme Soares Maia, Victor Elias Mouchrek Filho
The Essential Oils (EOs) from the leaves of species Cinnamomum verum J. Presl are used in the pharmaceutical industry for their numerous biological activities. Currently, the main compound of C. verum EO is eugenol which has acaricidal activity; however, a rare chemotype with benzyl benzoate as the main component can be found. Benzyl benzoate is recognized as an acaricide; however, studies of the C. verum EOs benzyl benzoate chemotype on Rhipicephalus microplus were not reported. The aim of this study was to evaluate the acaricide activity of an EO from a rare chemotype of C...
March 18, 2017: Veterinary Parasitology
Elina Felin, Anu Näreaho, Maria Fredriksson-Ahomaa
Toxoplasmosis is a globally distributed protozoal zoonosis. Pigs are considered an important reservoir of Toxoplasma gondii and pork a major infection source of human toxoplasmosis. ELISA methods are commonly used diagnostic tools for detecting Toxoplasma infections. They are also used for slaughterhouse-based serological monitoring of toxoplasmosis in pigs to identify positive farms. The methods used are non-standardised with varying sensitivity and specificity. In our study, four commercial ELISA tests for the detection of Toxoplasma antibodies in the meat juice of slaughter pigs were compared with a modified agglutination test (MAT) as a reference...
March 12, 2017: Veterinary Parasitology
Ana Caroline Moura Rodrigues, Rafaela Damasceno Magalhães, Kalil Andrade Mubarac Romcy, Jeferson Lucas Sousa Freitas, Ana Carolina Fonseca Lindoso Melo, Fernanda Cristina Macedo Rodon, Claudia Maria Leal Bevilaqua, Luciana Magalhães Melo
Phlebotomine sand flies are blood-feeding insects of marked medical and veterinary significance. Investigations on the biology of these insects hold great importance for both ecological and epidemiological purposes. The present work describes a new approach for real-time PCR (qPCR) with SYBR Green(®), named WMG-qPCR, to identify phlebotomine blood meals. The novelty of the assay was to design primers based on the Whole Mitochondrial Genome (WMG) of the potential hosts (human, dog, cat, brown rat and chicken) aiming to amplify through qPCR the regions of mitochondrial DNA (mtDNA) which are less conserved among all species...
March 9, 2017: Veterinary Parasitology
Emmanuel Dunstand-Guzmán, Claudia Hallal-Calleros, Jorge Morales-Montor, Víctor Manuel Hernández-Velázquez, Juan José Zárate-Ramos, Kurt L Hoffman, Guadalupe Peña-Chora, Fernando Iván Flores-Pérez
Bacillus thuringiensis is a bacteria known for its bioinsecticidal toxins and it has been proposed as an alternative in the treatment of several parasites that infect domestic animals (helminths, ticks, mites). In this work, we evaluated the clinical efficiency of the Bacillus thuringiensis GP532 strain in the treatment of six rabbits naturally infested with the P. cuniculi mite. GP532 extract (10mg/ml) was applied by aspersion in both pinna, with a second application after seven days, and the therapeutic effect was measured in both qualitative and quantitative manner...
March 9, 2017: Veterinary Parasitology
Miroslava Palikova, Ivana Papezikova, Zdenka Markova, Stanislav Navratil, Jan Mares, Lukas Mares, Libor Vojtek, Pavel Hyrsl, Eva Jelinkova, Heike Schmidt-Posthaus
Proliferative kidney disease (PKD) is an endoparasitic disease of salmonid fish caused by Tetracapsuloides bryosalmonae (Myxozoa: Malacosporea). This study presents a comprehensive view on PKD development in rainbow trout (Oncorhynchus mykiss) reared at an intensive fish breeding facility, with focus on mortality, pathology/histopathology, haematological findings and immune functions. Diseased and reference fish were sampled monthly and time course of natural infection was followed up from the onset of clinical signs (September 2014) to full recovery (January 2015)...
March 6, 2017: Veterinary Parasitology
Giana Bastos Gomes, Terrence L Miller, David B Vaughan, Dean R Jerry, Christina McCowan, Tracey L Bradley, Kate S Hutson
Parasitic Chilodonella species, Chilodonella piscicola and Chilodonella hexasticha, cause considerable economic losses globally to freshwater farmed fish production. Some genetic studies of Chilodonella spp. have indicated that many species within the genus may form cryptic species complexes. To understand the diversity of Chilodonella spp. infecting Australian freshwater farmed fish, specimens were isolated from infected barramundi (Lates calcarifer) and Murray cod (Maccullochella peelii) from fish farms in tropical north Queensland (QLD), temperate Victoria (Vic) and New South Wales (NSW) for genetic and morphological analysis...
March 6, 2017: Veterinary Parasitology
Brian Lassen, Claudio Oliviero, Toomas Orro, Elias Jukola, Tapio Laurila, Minna Haimi-Hakala, Mari Heinonen
The husbandry of pigs for meat production is a constantly developing industry. Most studies on the effects of Ascaris suum infection in pigs and its prevention with anthelmintics are over a decade old. We examined the effect of 2.5mg fenbendazole per kg bodyweight administered in drinking water for two consecutive days on A. suum infection 1 and 6 weeks after pigs arrived to fattening units. We hypothesised that the treatment would reduce the presence of A. suum-infections, improve the average daily weight gain of pigs, reduce the percentage of liver rejections in pens by 50% and increase the lean meat percentage at slaughter by 1%...
March 6, 2017: Veterinary Parasitology
Nadine Ravinet, Anne Lehebel, Nathalie Bareille, Carlos Lopez, Christophe Chartier, Alain Chauvin, Aurélien Madouasse
Targeted-selective treatments against gastrointestinal nematode (GIN) in adult dairy cows require the identification of "cows to treat", i.e. cows whose milk production (MP) would increase after treatment. This study aimed at quantifying the ability of multi-indicator profiles to identify such cows. A randomized controlled clinical trial was conducted at housing in 25 French pasturing dairy herds. In each herd, treated cows received fenbendazole orally, control cows remained untreated. Daily MP was recorded and the MP variation between the pre- and post-visit periods was calculated (ΔMP) for each cow...
March 2, 2017: Veterinary Parasitology
Serena Cavallero, Marco Pombi, Vitantonio Perrone, Giovanni Luigi Milardi, Stefano D'Amelio, Carlo Giuliani, Simona Gabrielli
Larval forms of the bot-fly Gasterophilus are obligate parasites commonly found in the gastrointestinal tract of equids, causing intestinal myiasis. Five species are reported so far in Italy, mostly observed during necroscopy, located in different portion of gastrointestinal tract of equids: G. intestinalis, G. nasalis, G. inermis, G. pecorum and G. haemorrhoidalis. An unusual finding of larval Gasterophilus intestinalis deeply inserted into the diaphragmatic muscle is here reported. Due to the uncommon localization, to the absence of clinical signs related to myiasis and subsequent uncertainty of species identity, identification was performed using an integrative taxonomical approach combining morphology with molecular tools for confirmatory reasons...
March 1, 2017: Veterinary Parasitology
Agnieszka Kloch, Ewa J Mierzejewska, Grzegorz Karbowiak, Kateryna Slivinska, Mohammed Alsarraf, Anna Rodo, Maciej Kowalec, Dorota Dwużnik, Yuliya M Didyk, Anna Bajer
The ornate dog tick Dermacentor reticulatus is vector of several blood parasites, including Babesia canis, a causative agent of babesiosis. The geographical range of D. reticulatus in Europe is discontinuous with a gap separating eastern and western macroregions. New foci observed in several locations in western and central Europe were considered an expansion of the western population, including foci in western Poland. In the present paper we used molecular markers to identify the origins of these foci, and we compared their genetic polymorphism to D...
February 28, 2017: Veterinary Parasitology
Vlasta Svobodova, Miroslav Svoboda, Lucia Friedlaenderova, Petr Drahotsky, Eva Bohacova, Gad Baneth
Transmission of canine leishmaniosis (CanL) is described in three consecutive generations of female Boxers living in a non-endemic environment in the Czech Republic. Infection of the first generation female likely occurred during a breeding visit to Italy and the dog died with typical clinical signs of the disease but without definitive laboratory diagnosis. The second and third generation offsprings never left the Czech Republic, suffered from clinical CanL confirmed by polymerase chain reaction and serology, and were apparently infected by transplacental transmission...
February 27, 2017: Veterinary Parasitology
Pavlo Maksimov, Gereon Schares, Sebastian Press, Andreas Fröhlich, Walter Basso, Mandy Herzig, Franz J Conraths
Effective and sensitive methods for the molecular detection of Echinococcus multilocularis in faecal samples of final hosts are crucial for the prevention and control of human alveolar echinococcosis and for studies on the epidemiology of the parasite. Little is known about the suitability of commercial test kits for isolating DNA of E. multilocularis from fox faeces and the performance of standard Polymerase Chain Reaction (PCR) protocols in relation to the quality of DNA extracted by these kits. We compared four different kits: ZR Faecal DNA MiniPrep™ (Zymo Research), FastDNA(®) SPIN Kit for Soil (MP Biomedicals), QIAamp(®) Fast DNA Stool Mini Kit (QIAGEN) and NucleoSpin(®) Soil Kit (Macherey-Nagel) for the extraction of DNA from E...
February 24, 2017: Veterinary Parasitology
Brayan Alexander Fonseca Martinez, Vanessa Bielefeldt Leotti, Mauro Riegert Borba, Gustavo de Sousa E Silva, Luís Gustavo Corbellini
The purpose of this study was to use mixed logistic regression to evaluate the association between Neospora caninum serostatus and abortion, accounting for the effects of farms. The main objective was to explore the interpretation of this model and discuss the contribution of this analysis to our understanding of the disease's epidemiology. A mixed-effects logistic model using farms as a random effect and the serostatus for N. caninum, age of cattle and farm location as fixed effects was performed. The data from 1256 cows over 15 months of age from 60 farms were used, and the abortion information was obtained from farm records...
February 24, 2017: Veterinary Parasitology
Caroline F Frey, Norbert Müller, Norbert Stäuber, Nelson Marreros, Larissa Hofmann, Brigitte Hentrich, Gaby Hirsbrunner
Cows on an alpine pasture were presented with severe signs of vaginitis. To rule out infection with Tritrichomonas foetus, vaginal swabs were taken and real-time PCR based on detection via fluorescence resonance energy transfer (FRET) probes and targeting the first internal transcribed spacer (ITS-1) of nuclear ribosomal DNA (rDNA) was performed. PCR was positive in 25 of totally 34 assessed cows. However, the melting profiles of the probes targeting the diagnostic PCR products differed from the T. foetus positive control...
February 24, 2017: Veterinary Parasitology
Keyla Carstens Marques de Sousa, Marina Pugnaghi Fernandes, Heitor Miraglia Herrera, Jyan Lucas Benevenute, Filipe Martins Santos, Fabiana Lopes Rocha, Wanessa Teixeira Gomes Barreto, Gabriel Carvalho Macedo, João Bosco Campos, Thiago Fernandes Martins, Pedro Cordeiro Estrela de Andrade Pinto, Darci Barros Battesti, Eliane Mattos Piranda, Paulo Henrique Duarte Cançado, Rosangela Zacarias Machado, Marcos Rogério André
Hepatozoon parasites comprise intracellular apicomplexan parasites transmitted to vertebrate animals by ingestion of arthropods definitive hosts. The present work aimed to investigate the occurrence of Hepatozoon spp. in wild animals, domestic dogs and their respective ectoparasites, in southern Pantanal region, central-western Brazil, by molecular techniques. Between August 2013 and March 2015, 31 coatis (Nasua nasua), 78 crab-eating foxes (Cerdocyon thous), seven ocelots (Leopardus pardalis), 42 dogs (Canis lupus familiaris), 110 wild rodents (77 Thichomys fosteri, 25 Oecomys mamorae, and 8 Clyomys laticeps), 30 marsupials (14 Thylamys macrurus, 11 Gracilinanus agilis, 4 Monodelphis domestica and 1 Didelphis albiventris), and 1582 ticks and 80 fleas collected from the sampled animals were investigated...
February 22, 2017: Veterinary Parasitology
Fangyuan Yin, Junlong Liu, Aihong Liu, Youquan Li, Jianxun Luo, Guiquan Guan, Hong Yin
Rapid and accurate diagnosis of Theileria annulata infection contributes to the formulation of strategies to eradicate this parasite. A simple and efficient diagnostic tool, recombinase polymerase amplification (RPA) combined with a lateral flow (LF) strip, was used in detection of Theileria and compared to other methods that require expensive instruments and skilled personnel. Herein, we established and optimized an LF-RPA method to detect the cytochrome b gene of T. annulata mitochondrial DNA from experimentally infected and field-collected blood samples...
February 21, 2017: Veterinary Parasitology
Richard Budgey, Jane Learmount, Graham C Smith
The parasitic tapeworm Echinococcus multilocularis is the causative agent of alveolar echinococcosis, a serious zoonotic infection present in Europe that can be fatal. The United Kingdom currently has E. multilocularis free status but the possibility of introduction exists, most likely via an imported or returning dog or other deliberately introduced animal that has not had anthelmintic treatment. We have developed a model to predict the probability of successfully eliminating a focal outbreak of E. multilocularis using a programme of anthelmintic bait distribution...
February 21, 2017: Veterinary Parasitology
Thomas Tzelos, Jessica S G Barbeito, Martin K Nielsen, Eric R Morgan, Jane E Hodgkinson, Jacqueline B Matthews
Parasitic nematodes, particularly cyathostomins, are ubiquitous in grazing horses world-wide. Considerable burdens of cyathostomin larvae can encyst in the large intestinal wall. The most recommended treatment against these pathogenic stages is moxidectin. Information is required on how effective moxidectin is against cyathostomin populations in different regions. The objectives here were to determine the efficacy of moxidectin treatment and estimate the strongyle egg reappearance period (ERP) after treatment in several equine populations, to confirm the type of strongyle nematodes present and to identify other (i...
February 21, 2017: Veterinary Parasitology
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