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bioRxiv · 10.64898/2026.02.05.704122

A Comprehensive epidemiological and molecular study of gastrointestinal helminths of Companion Animals in Northeastern Bangladesh: A neglected zoonotic threat

Nath, T. C.·Nyema, J.·Raquib, R.·Siddiki, T.·Tasnim, J.·Prity, Z. S.·Tarek, M.·Mukutmoni, M.·Islam, K. M.·Ahmed, S.
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Abstract

BackgroundGastrointestinal helminths of companion animals are neglected sources of zoonotic infection in low and middle-income countries. In Bangladesh, close humananimal contact and large free-roaming dog and cat populations may facilitate parasite transmission, yet region-specific data remain limited. This study assessed the prevalence, species diversity, and zoonotic potential of gastrointestinal helminths in companion animals in northeastern Bangladesh. MethodsA cross-sectional study was conducted between January and December 2025 across urban and rural areas of the Sylhet Division. Fecal samples from 900 animals (600 dogs and 300 cats; owned and stray) were examined using standard coproscopic techniques. Molecular confirmation of selected positive samples was performed using PCR targeting ITS-2, 18S rRNA, and mitochondrial cox1 genes, followed by sequencing. Risk factors associated with infection were evaluated using multivariable logistic regression. ResultsOverall, 45.9% (95% CI: 42.6-49.2) of animals were infected with at least one gastrointestinal helminth, with mixed infections detected in 18.4%. Prevalence was similar in dogs (45.7%) and cats (46.3%) but significantly higher in stray animals (65.7%) than in owned animals (36.6%). Predominant zoonotic helminths included Ancylostoma spp., Toxocara canis, Toxocara cati, Dipylidium caninum, and Taenia/Echinococcus spp. Molecular analysis confirmed 93% of morphologically identified infections and revealed high genetic similarity to zoonotic reference strains. Stray status, lack of deworming, young age, and outdoor roaming were significant risk factors for infection (p < 0.05). ConclusionsCompanion dogs and cats in northeastern Bangladesh harbor a high burden of zoonotic gastrointestinal helminths and represent important reservoirs for human exposure. Strengthening One Health-based surveillance, routine deworming, and stray animal management is essential to reduce zoonotic transmission.

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Nath, T. C., Nyema, J., Raquib, R., Siddiki, T., Tasnim, J., Prity, Z. S., Tarek, M., Mukutmoni, M., Islam, K. M., Ahmed, S.. 2026-02-06. A Comprehensive epidemiological and molecular study of gastrointestinal helminths of Companion Animals in Northeastern Bangladesh: A neglected zoonotic threat. https://doi.org/10.64898/2026.02.05.704122

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