Abstract
Purpose
Soil-transmitted nematodes (STNs) are widespread in tropical and subtropical regions, particularly where the communities are socio-economically challenged. We investigated the effect of soil temperature on the prevalence and intensity of STN infection in free-roaming dogs.
Methods
Fresh faecal samples collected from free-roaming dogs in Digana and Pussellawa town areas in the Kandy District, Sri Lanka, were microscopically analysed for canine STNs. Soil temperature was measured at each sampling site. Highly prevalent canine hookworm Ancylostoma, was further studied using PCR and sequencing, followed by phylogenetic analysis.
Results
The soil temperature ranged between 28 and 31 °C (mean = 29.79 °C) and 18–21 °C (mean = 19.52 °C) in Digana and Pussellawa, respectively, showing a significant difference in the two sites (Students t-test t = 1.68, p < 0.0001). Of the total 44 dogs sampled, 41 (93.2%) were positive for STNs. During microscopic analysis, five nematodes: Ancylostoma spp., Capillaria sp., Strongyloides sp., Toxocara canis, and Trichuris sp., were identified. Ancylostoma species (93.2%) were the most prevalent, followed by Strongyloides sp. (22.7%) and Toxocara canis (15.9%). Infection prevalence of Strongyloides sp. was higher in Digana (40.9%) compared to that in Pussellawa (4.5%; Chi-square test, χ2 = 8.28, p = 0.004) and also the infection intensity from Digana (EPG = 8.02 ± 20.2) compared to that from Pussellawa (0.45 ± 2.1; Mann Whitney U test, p = 0.006). Amplicons (ITS1-5.8S-ITS2) of the expected size for A. caninum, and A. tubaeforme were produced. An A. caninum sequence reported here (OQ101719) illustrated the highest similarity of 99.2% to one of the local sequences (MZ707153) upon pairwise comparison.
Conclusion
Digana, with a higher soil temperature than Pussellawa, had a significantly higher prevalence and infection intensity, particularly Strongyloides sp. This study also signifies the first molecular identification of hookworm species A. tubaeforme in Sri Lanka.
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Data Availability
The datasets generated during and/or analysed during the current study are available on the Open Science Framework site (link: https://osf.io/tpd9g).
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Acknowledgements
We thank the technical staff of the Department of Zoology and the Department of Veterinary Pathobiology of University of Peradeniya for providing immense support in laboratory work. This work was supported by the University of Peradeniya Research Grants (Grant No: URG/2022/64/S).
Funding
This work was funded by the University of Peradeniya Research Grants (Grant no: URG/2022/64/S) Piyumali K. Perera.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by [Sakunika Amarasingha] and [Piyumali K. Perera]. The first draft of the manuscript was written by [Sakunika Amarasingha] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Ethical clearance for the study was obtained from the Ethical Clearance Committee of Postgraduate Institute of Science, University of Peradeniya, Sri Lanka (Reference no: CEC_PGIS_2022_04).
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Amarasingha, S., Anupama, N.M.T., Rajakaruna, R.S. et al. Effect of Soil Temperature on Canine Soil-Transmitted Nematodes in Kandy District with the First Record of Hookworm, Ancylostoma tubaeforme from Sri Lanka. Acta Parasit. (2024). https://doi.org/10.1007/s11686-024-00829-8
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DOI: https://doi.org/10.1007/s11686-024-00829-8