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Background Trichostrongylus is one of the most important nematodes infecting animals and humans. The current study was designed to identify the Trichostrongylus species infecting goats by multiplex PCR and phylogenetic analysis. Methods A total of 124 goats’ viscera were collected from different abattoirs of Mymensingh division. Trichostrongylus species were isolated and characterized based on morphometry, multiplex PCR and phylogenetic analysis. Results Among 124 viscera of goats, 39 were positive with two species, Trichostrongylus colubriformis and Trichostrongylus vitrinus, revealing an overall 31.45% prevalence. Morphological identification of Trichostrongylus species was confirmed by multiplex PCR amplification of the ITS2 gene and sequencing. Partial sequencing of the ITS2 gene of two species revealed seven single nucleotide polymorphisms (three transitions and four transversions) in this study. The neighbor-joining phylogenetic tree demonstrated that T. colubriformis and T. vitrinus isolates were clustered together with the reference sequences that belong to the clade A and B without any geographical boundaries. Conclusions This is the first report on molecular and phylogenetic analysis of Trichostrongylus species from ruminants in Bangladesh. These results provide the baseline data for understanding the zoonosis and epidemiology of this parasite in Bangladesh and global perspectives.

Toxocariasis is a paramount parasitic disease having over 50% prevalence among newborn buffalo calves in Bangladesh. The objective of this study was to compare the efficacy of clinically used anthelmintics and their subsequent effects on the hematological parameters and body weight in buffalo calves in commercial buffalo farms in coastal region. Thirty-two buffalo calves below 3 months of age with clinical Toxocara infection had been selected and treated with albendazole (ABZ), levamisole (LVM) and ivermectin (IVM). The EPG counts, hematological parameters and initial body weight of buffalo calves were recorded on the day of anthelmintic treatment (day 0). Fecal samples were collected on day 14 and 28 including hematological parameters and body weight were recorded on day 28 post-treatment. The efficacy (%) of anthelmintics were estimated by fecal egg count reduction test (FECRT). The parameters like Hb, PCV, ESR, TEC, TLC were analyzed from the blood samples. The FECRT revealed 96.83% efficacy for IVM followed by 94.23% and 85.84% for LVM and ABZ, respectively. Anthelmintic treated calves showed significant (p<0.01) increase in Hb, PCV, TEC and body weight, and decrease in ESR and TLC as a result of worm expulsion from buffalo calves after 28 days of post-treatment. Among the tested anthelmintics, IVM was found to be more effective against toxocariasis in buffalo calves. This is a novel new information on anthelmintics efficacy in buffalo calves in Bangladesh. Further studies are imperative to explore the factors responsible for high prevalence of this deadly nematode in buffalo calves.

Toxocariasis is a paramount parasitic disease having over 50% prevalence among newborn buffalo calves in Bangladesh. The objective of this study was to compare the e cacy of clinically used anthelmintics and their subsequent effects on the hematological parameters and body weight in buffalo calves in commercial buffalo farms in coastal region. Thirty-two buffalo calves below 3 months of age with clinical Toxocara infection had been selected and treated with albendazole (ABZ), levamisole (LVM) and ivermectin (IVM). The EPG counts, hematological parameters and initial body weight of buffalo calves were recorded on the day of anthelmintic treatment (day 0). Fecal samples were collected on day 14 and 28 including hematological parameters and body weight were recorded on day 28 post-treatment. The e cacy (%) of anthelmintics were estimated by fecal egg count reduction test (FECRT).The parameters like Hb, PCV, ESR, TEC, TLC were analyzed from the blood samples. The FECRT revealed 96.83% e cacy for IVM followed by 94.23% and 85.84% for LVM and ABZ, respectively. Anthelmintic treated calves showed signi cant (p<0.01) increase in Hb, PCV, TEC and body weight, and decrease in ESR and TLC as a result of worm expulsion from buffalo calves after 28 days of post-treatment. Among the tested anthelmintics, IVM was found to be more effective against toxocariasis in buffalo calves. This is a novel new information on anthelmintics e cacy in buffalo calves in Bangladesh. Further studies are imperative to explore the factors responsible for high prevalence of this deadly nematode in buffalo calves.

Trichostrongylus is one of the most economically important and zoonotic trichostrongylid nematode infecting both animals and humans, causing a disease known as trichostrongyliasis. The study was designed to identify Trichostrongylus species infecting goats by morphology-morphometry followed by multiplex PCR and phylogenetic characterization. A total of 124 viscera of goats were collected from different slaughter houses of Mymensingh division of Bangladesh, processed and trichostrongylids were isolated and identified under microscope. Among 124 viscera of goats, 39 were positive with two species of Trichostrongylus, namely, T. colubriformis and T. vitrinus showing an overall 31.45% prevalence. Morphological identification of Trichostrongylus species was confirmed by multiplex PCR amplification of ITS2 gene and sequencing (accession numbers ON721586 to ON721593 for T. colubriformis and T. vitrinus, respectively). Partial sequencing of ITS2 gene of T. vitrinus and T. colubriformis showed 3 and 4 haplotypes, respectively and 7 single nucleotide polymorphisms (SNP) were detected (3 transitions and 4 transversions). The neighbor-joining phylogenetic tree demonstrated that T. colubriformis and T. vitrinus isolates were clustered together with the reference sequences of T. colubriformis and T. vitrinus isolates that belongs to the clade A and B without any geographical boundaries. This is the first report on molecular study and phylogenetic analysis of Trichostrongylus species from goat in Bangladesh. The finding from this study will provide the baseline data for identification, differentiation and phylogenetic analysis of Trichostrongylus species in Bangladesh. Further, extensive investigation is imperative to reveal the population genetics of Trichostrongylus parasite from other livestock and humans of Bangladesh.