著者

Seiki TAKATSUKI Shingo MIURA Kazuo SUZUKI Kaori ITO-SAKAMOTO

出版者

The Mammal Society of Japan

雑誌

Journal of the Mammalogical Society of Japan (ISSN:09141855)

巻号頁・発行日

vol.15, no.2, pp.91-98, 1991 (Released:2010-08-25)

参考文献数

21

被引用文献数

1

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A mass mortality of sika deer (Cervus nippon) population occurred on Kinkazan Island in northern Japan in the spring of 1984, which followed an unusual cold winter. We collected a sample of 240 deer skulls. All deer were aged and sexed except some fawns. The sex ratio of >1 year old deer was 50: 50, but was skewed toward males compared with the sex ratio obtained in the population census in 1983. The oldest age at death was 12.5 years for males and 15.5 years for females. The frequency was low for young age classes. A relative cumulative frequency curve was constructed to examine the age-specific mortality pattern. The curves of both sexes suggested that mortality was relatively high for fawns and low for adult and prime-aged animals, and that mortality was higher and life span was shorter for males than for females.

著者

Kango TATEMOTO Keita ISHIJIMA Yudai KURODA Milagros Virhuez MENDOZA Yusuke INOUE Eunsil PARK Hiroshi SHIMODA Yuko SATO Tadaki SUZUKI Kazuo SUZUKI Shigeru MORIKAWA Ken MAEDA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.22-0236, (Released:2022-05-31)

被引用文献数

5

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The present study investigated severe fever with thrombocytopenia syndrome virus (SFTSV) infection in raccoons in Wakayama Prefecture from 2007 to 2019. To perform surveillance, an enzyme-linked immunosorbent assay (ELISA) was established, and the sensitivity and specificity of the ELISA were 100% in comparison with a 50% focus-reduction neutralization assay. Using the established ELISA, we performed serosurveillance of SFTSV infection in 2,299 raccoons in Tanabe region, Wakayama Prefecture from 2007 to 2019. The first anti-SFTSV-positive raccoon was captured in October 2009. The seroprevalence of SFTSV infection was <10% between April 2009 and March 2013, 23.9% between April 2013 and March 2014, 37.5% between April, 2014 and March 2015, and over 50% from April 2015. Next, we performed detection of SFTSV genes in sera of raccoons captured in Wakayama Prefecture after April 2013. The results indicated that 2.4% of raccoons were positive for SFTSV genes and that the frequency of SFTSV infection among raccoons between January and March (0.7%) was lower than that between April and June (3.4%). In addition, virus genes were detected from many specimens, including sera and feces of two raccoons, and viral antigens were detected in lymphoid cells in lymphoid follicles in the colon by immunohistochemical staining. In conclusion, SFTSV had recently invaded the area and had rapidly spread among wild animals. The first patient in this area was reported in June 2014, indicating that raccoons are good sentinels for assessing the risk of SFTSV in humans.

著者

Junko SUZUKI Yohei NISHIO Yuki KAMEO Yutaka TERADA Ryusei KUWATA Hiroshi SHIMODA Kazuo SUZUKI Ken MAEDA

出版者

公益社団法人 日本獣医学会

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.77, no.11, pp.1457-1463, 2015 (Released:2015-12-01)

参考文献数

28

被引用文献数

3 16

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In 2007–2008, a canine distemper virus (CDV) epidemic occurred among wild animals in Wakayama Prefecture, Japan, and many mammals, including the wild boar and deer, were infected. In this study, CDV prevalence among wild animals was surveyed before and after the epidemic. At first, an enzyme-linked immunosorbent assay (ELISA) with horseradish peroxidase-conjugated protein A/G was established to detect CDV antibodies in many mammalian species. This established ELISA was available for testing dogs, raccoons and raccoon dogs as well as virus-neutralization test. Next, a serological survey of wild mammalians was conducted, and it was indicated that many wild mammalians, particularly raccoons, were infected with CDV during the epidemic, but few were infected before and after the epidemic. On the other hand, many raccoon dogs died during the epidemic, but CDV remained prevalent in the remaining population, and a small epidemic occurred in raccoon dogs in 2012–2013. These results indicated that the epidemic of 2007–2008 may have been intensified by transmission to raccoons.