Experimental Assessment of the Pathogenicity of H5N1 Influenza A Viruses Isolated in Japan

Masaji Mase; Tadao Imada; Kikuyasu Nakamura; Nobuhiko Tanimura; Kunitoshi Imai; Kenji Tsukamoto; Shigeo Yamaguchi

doi:10.1637/7364-041105R.1

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Masaji Mase,¹ Tadao Imada,¹ Kikuyasu Nakamura,¹ Nobuhiko Tanimura,¹ Kunitoshi Imai,² Kenji Tsukamoto,¹ Shigeo Yamaguchi¹

¹Department of Infectious Diseases, National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan
²Obihiro University of Agriculture and Veterinary Medicine, 2-11 Inada, Obihiro, Hokkaido 080-8555, Japan

Abstract

We examined the pathogenicity for chickens of two H5N1 avian influenza viruses isolated in Japan, A/chicken/Yamaguchi/7/2004 (Ck/Yamaguchi/7/04) isolated from outbreaks in commercial layer chickens, and A/duck/Yokohama/aq10/2003 (Dk/Yokohama/aq10/03) isolated from duck meat imported from China. All chickens inoculated intranasally with either strain died, and the viruses were reisolated from all organs examined. However, both the mean time of onset of clinical signs and the mean death time of Ck/Yamaguchi/7/04 were shorter than those of Dk/Yokohama/aq10/03.

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Masaji Mase, Tadao Imada, Kikuyasu Nakamura, Nobuhiko Tanimura, Kunitoshi Imai, Kenji Tsukamoto, and Shigeo Yamaguchi "Experimental Assessment of the Pathogenicity of H5N1 Influenza A Viruses Isolated in Japan," Avian Diseases 49(4), 582-584, (1 December 2005). https://doi.org/10.1637/7364-041105R.1

Received: 11 April 2005; Accepted: 1 July 2005; Published: 1 December 2005

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EID = egg infectious dose

H5N1 subtype

HPAI = highly pathogenic avian influenza

IC = in contact

IN = inoculated intranasally

influenza A virus

MDT = mean death time in days

MTO = mean time of onset of signs in days

pathogenicity

SPF = specific pathogen free

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