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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

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...

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Main Authors: Uni, Shigehiko, Fukuda, Masako, Uga, Shoji, Agatsuma, Takeshi, Nakatani, Jun, Suzuki, Kazuo, Yokohata, Yasushi, Kimura, Daisuke, Takaoka, Hiroyuki
Format: Article
Published: Elsevier 2021
Subjects:
R Medicine
Online Access:http://eprints.um.edu.my/25971/
https://doi.org/10.1016/j.parint.2021.102313
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spelling my.um.eprints.259712021-05-07T03:52:29Z http://eprints.um.edu.my/25971/ 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 Fukuda, Masako Uga, Shoji Agatsuma, Takeshi Nakatani, Jun Suzuki, Kazuo Yokohata, Yasushi Kimura, Daisuke Takaoka, Hiroyuki R Medicine 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 Elsevier 2021 Article PeerReviewed 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 https://doi.org/10.1016/j.parint.2021.102313 doi:10.1016/j.parint.2021.102313
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic R Medicine
spellingShingle R Medicine
Uni, Shigehiko
Fukuda, Masako
Uga, Shoji
Agatsuma, Takeshi
Nakatani, Jun
Suzuki, Kazuo
Yokohata, Yasushi
Kimura, Daisuke
Takaoka, Hiroyuki
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
description 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
format Article
author Uni, Shigehiko
Fukuda, Masako
Uga, Shoji
Agatsuma, Takeshi
Nakatani, Jun
Suzuki, Kazuo
Yokohata, Yasushi
Kimura, Daisuke
Takaoka, Hiroyuki
author_facet Uni, Shigehiko
Fukuda, Masako
Uga, Shoji
Agatsuma, Takeshi
Nakatani, Jun
Suzuki, Kazuo
Yokohata, Yasushi
Kimura, Daisuke
Takaoka, Hiroyuki
author_sort Uni, Shigehiko
title 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
title_short 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_sort 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
publisher Elsevier
publishDate 2021
url http://eprints.um.edu.my/25971/
https://doi.org/10.1016/j.parint.2021.102313
_version_ 1702170272454410240
score 13.211869

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