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Review
. 2024 Jun;30(6):1236-1239.
doi: 10.3201/eid3006.231641.

Human Passage of Schistosoma incognitum, Tamil Nadu, India, and Review of Autochthonous Schistosomiasis, South Asia

Sitara S R Ajjampur, Rajiv Sarkar, Richard S Bradbury
Review

Human Passage of Schistosoma incognitum, Tamil Nadu, India, and Review of Autochthonous Schistosomiasis, South Asia

Sitara S R Ajjampur et al. Emerg Infect Dis. 2024 Jun.

Abstract

A fecal survey in Tamil Nadu, India, revealed 2 persons passed schistosome eggs, later identified as Schistosoma incognitum, a parasite of pigs, dogs, and rats. We investigated those cases and reviewed autochthonous schistosomiasis cases from India and Nepal. Whether the 2 new cases represent true infection or spurious passage is undetermined.

Keywords: India; Nepal; Schistosoma; Schistosomiasis; parasites; zoonoses.

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Figures

Figure 1
Figure 1
Schistosoma incognitum egg identified in the feces of a woman from Tamil Nadu, India. Saline direct smear. Original magnification ×400; scale bar indicates 25 µm.
Figure 2
Figure 2
Geographic locations of Schistosoma incognitum passage from humans and autochthonous human schistosomiasis in India and Nepal. Map shows credible reports of urinary or fecal passage of schistosome eggs in India and Nepal from this study and others (,–11,14,15). Included patients had no reported travel history to known endemic areas. Where possible, state and district information are provided.
See this image and copyright information in PMC

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References

    1. Chandler AC. A new schistosome infection of man, with notes on other human fluke infections in India. Indian J Med Res. 1926;14:179–83.
    1. Sinha PK, Srivastava HD. Studies on Schistosoma incognitum Chandler, 1926. I. On the synonymy and morphology of the blood-fluke. Parasitology. 1956;46:91–100. 10.1017/S0031182000026366 - DOI - PubMed
    1. Ajjampur SSR, Kaliappan SP, Halliday KE, Palanisamy G, Farzana J, Manuel M, et al. Epidemiology of soil transmitted helminths and risk analysis of hookworm infections in the community: Results from the DeWorm3 Trial in southern India. PLoS Negl Trop Dis. 2021;15:e0009338. 10.1371/journal.pntd.0009338 - DOI - PMC - PubMed
    1. Agrawal MC. The schistosomes. In: Agrawal MC editor. Schistosomes and schistosomiasis in South Asia. New Delhi: Springer India; 2012. p. 7–50.
    1. Carney WP, Brown RJ, Van Peenen PF, Purnomo, Ibrahim B, Koesharjono CR. Schistosoma incognitum from Cikurai, West Java, Indonesia. Int J Parasitol. 1977;7:361–6. 10.1016/0020-7519(77)90060-1 - DOI - PubMed