Avian Filariasis in Backyard Chickens in Japan

  • Maki Sekiguchi
    Chuo Livestock Hygiene Service Center of Chiba Prefecture, 497 Iwatomi-cho, Sakura, Chiba 285-0072, Japan
  • Nariaki Nonaka
    Laboratory of Veterinary Parasitic Diseases, Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki, Miyazaki 889-2192, Japan
  • Mamoru Adachi
    Laboratory of Veterinary Parasitic Diseases, Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki, Miyazaki 889-2192, Japan
  • Tamami Sekiya
    Toubu Livestock Hygiene Service Center of Chiba Prefecture, 1105-3 Kawaba, Tougane, Chiba 283-0064, Japan
  • Yu Yamamoto
    National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan

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Description

In May 2017, a hen in a backyard chicken flock in Japan exhibited mild clinical signs, and the bird was examined for diagnosis. Unexpectedly, many microfilariae were observed in the lung by histologic examination, although no adult worms were detected within the body. In a blood test performed in July, microfilaremia was confirmed in a few clinically normal chickens of the same flock. Molecular analysis of the nematode partial 18S ribosomal RNA gene revealed that the gene detected in the lung of the necropsied hen was positioned in the group of the family Onchocercidae in the phylogenetic tree. These data show that avian filarioids that can infect chickens inhabit Japan.

Journal

  • Avian Diseases

    Avian Diseases 62 (3), 326-329, 2018-09

    American Association of Avian Pathologists (AAAP)

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