Prevalence of Onchocerca japonica and O. takaokai infections in the Japanese wild boar, Sus scrofa leucomystax, and the Ryukyu wild boar, S. s. riukiuanus, in Japan

Uni, Shigehiko and Fukuda, Masako and Uga, Shoji and Agatsuma, Takeshi and Nakatani, Jun and Suzuki, Kazuo and Yokohata, Yasushi and Kimura, Daisuke and Takaoka, Hiroyuki (2021) Prevalence of Onchocerca japonica and O. takaokai infections in the Japanese wild boar, Sus scrofa leucomystax, and the Ryukyu wild boar, S. s. riukiuanus, in Japan. Parasitology International, 83. p. 102313. ISSN 1383-5769

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Official URL: https://doi.org/10.1016/j.parint.2021.102313

Abstract

Reports of zoonotic infections with Onchocerca japonica (Nematoda: Filarioidea), which parasitizes the Japanese wild boar, Sus scrofa leucomystax, have recently increased in Japan. To predict the occurrence of infection in humans, it is necessary to determine the prevalence of O. japonica infection in the natural host animals. We investigated the presence of adult worms in the footpads, and of microfilariae in skin snips, taken from the host animals, between 2000 and 2018. Onchocerca japonica was found in 165 of 223 (74%) Japanese wild boars in Honshu and Kyushu. Among the nine regions studied, the highest prevalence of O. japonica infection was found in Oita, Kyushu, where 47 of 52 (90.4%) animals were infected. The ears were the predilection sites for O. japonica microfilariae. Adult worms of O. japonica were found more frequently in the hindlimbs than in the forelimbs of the host animals. Onchocerca takaokai was found in 14 of 52 (26.9%) Japanese wild boars in Oita. In Kakeroma Island among the Nansei Islands, both O. japonica and O. takaokai were isolated from the Ryukyu wild boar, S. s. riukiuanus. These observations could help predict future occurrences of human zoonotic onchocercosis in Japan. © 2021

Item Type: Article
Uncontrolled Keywords: Filarioidea; Kakeroma Island; Onchocercosis; Suidae; Vector-borne disease; Zoonosis
Subjects: R Medicine
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Tropical Infectious Diseases Research and Education Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 07 May 2021 03:52
Last Modified: 07 May 2021 03:52
URI: http://eprints.um.edu.my/id/eprint/25971

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