Abstract
Cryptosporidium is one of the most common causes of diarrhoea around the world. Successful management and prevention of this infectious disease requires knowledge of the diversity of species and subtypes causing human disease. We use sequence data from 2598 human faecal samples collected during an 11-year period (2009–2019) to better understand the impact of different species and subtypes on public health and to gain insights into the variation of human cryptosporidiosis in New Zealand. Human cryptosporidiosis in New Zealand is caused by a high diversity of species and subtypes. Six species cause human disease in New Zealand: C. hominis, C. parvum, C. cuniculus, C. erinacei, C. meleagridis and C. tyzzeri. Sequence analysis of the gp60 gene identified 16 subtype families and 101 subtypes. Cryptosporidium hominis IbA10G2 and C. parvum IIaA18G3R1 were the most frequent causes of human cryptosporidiosis with 27% and 29% of infections, respectively. Cryptosporidium hominis presented a peak of notified human cases during autumn (March–May) whereas most cases of human cryptosporidiosis caused by C. parvum are found during the calving and lambing season in spring (September–November). We also reported some subtypes that have been rarely detected in other countries such as IbA20G2 and IIoA13G1 and a low prevalence of the hypertransmissible and virulent IIaA15G2R1. This study provides insight into the variability of cryptosporidiosis in New Zealand essential for disease management and surveillance to prevent the introduction or spread of new species and subtypes in the country.
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Acknowledgments
We would like to thank the New Zealand Ministry of Health. DTSH is supported by Royal Society Te Apārangi Rutherford Discovery Fellowship RDF-MAU1701. This investigation is funded by the New Zealand Ministry of Health. Anonymous reviewers provided helpful comments that greatly improved this manuscript.
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Garcia-R, J.C., Pita, A.B., Velathanthiri, N. et al. Species and genotypes causing human cryptosporidiosis in New Zealand. Parasitol Res 119, 2317–2326 (2020). https://doi.org/10.1007/s00436-020-06729-w
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DOI: https://doi.org/10.1007/s00436-020-06729-w