BACKGROUND Benzimidazole (BZ) resistance in gastrointestinal nematodes is associated with a single nucleotide polymorphism (SNP) at codons 167, 198 and 200 in the isotype 1 of beta-tubulin gene although in some species these SNPs have also been associated with resistance to macrocyclic lactones. In the present study we compared the levels of resistance in Teladorsagia circumcincta and Trichostr...

An understanding of how genes move between and within populations of parasitic nematodes is important in combating the evolution and spread of anthelmintic resistance. Much has been learned by studying mitochondrial DNA markers, but autosomal markers such as microsatellites have been applied to only a few nematode species, despite their many advantages for studying gene flow in eukaryotes. Here...

It is normal for hosts to be co-infected by parasites. Interactions among co-infecting species can have profound consequences, including changing parasite transmission dynamics, altering disease severity and confounding attempts at parasite control. Despite the importance of co-infection, there is currently no way to predict how different parasite species may interact with one another, nor the ...

The prevalence of gastric nematodes in 151 goats on Grand Canary Island is around 56%, with a mean burden of 691 worms/animal. No significant differences of prevalence and intensity were found between the four isoclimatic areas of the island [dry-desert (DD); dry-steppe (DS); temperate-mild (TM); temperate-cold (TC)]. Five nematode species were identified, the most commonly-occurring being Tela...

La trichostrongylosis es una zoonosis de rara ocurrencia causada por nematodos intestinales, favorecida el consumo vegetales crudos o agua contaminada con larvas infectantes Trichostrongylus spp. En 2015, se registró un brote familiar transmitido alimentos en zona rural Valdivia, afectando a mujer 51 años edad y su pareja e hija 56 12 años; respectivamente. Solo la adulta, caso índice, pres...

Abstract The effect of four diets on the performance Dorper lambs that were artificially mix-infected with 1000 infective larvae (L3) Haemonchus contortus and L3 Trichostrongylus colubriformis every three days for 12 weeks was evaluated. For each diet, one infected group (n = 7) control 4) set up. contained following proportions hay (H) concentrate (C): Diet 1 - 100%H; 2 75%H:25%C; 3 50%H:50%C;...

Biogenic amines serve as neurotransmitters in vertebrates and insects, and their occurrence has been reported in a number of other species of invertebrates. Among helminths, they have been isolated from the liver fluke Fasciola hepatica (9) and the nematodes Ascar# lumbricoides (10), Ascaridia galli (10), Nippostrongylus brasiliensis (1), Litomosoides carinii (12), Caenorhabditis elegans (8), a...