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Showing content from https://link.springer.com/doi/10.1007/s00705-004-0372-1 below:

Co-infection of Staphylococcus aureus or Haemophilus paragallinarum exacerbates H9N2 influenza A virus infection in chickens

H9N2 influenza viruses are frequently isolated from chicken meat and bone marrow imported from China to Japan since 2001. These isolates were experimentally inoculated into specific pathogen-free chickens intranasally. Viruses were recovered from the meat and bone marrow of birds showing no overt signs. On the other hand, chickens co-infected with H9N2 virus and either Staphylococcus aureus or Haemophilus paragallinarum showed clinical signs severer than those shown by birds infected only with the virus alone or each of the bacteria alone. In addition, H9N2 viruses were more efficiently recovered from the chickens co-infected with S. aureus or H. paragallinarum than those from the birds infected with only the virus. The present results indicate that co-infection of H9N2 influenza virus with S. aureus or H. paragallinarum enhances the replication of the virus in chickens, resulting in exacerbation of the H9N2 virus infection.

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1. Laboratory of Microbiology, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan

   N. Kishida, Y. Sakoda & H. Kida

2. Animal Quarantine Service, Ministry of Agriculture, Forestry and Fisheries, Isogo, Yokohama, Japan

   M. Eto & Y. Sunaga

1. N. Kishida
2. Y. Sakoda
3. M. Eto
4. Y. Sunaga
5. H. Kida

Kishida, N., Sakoda, Y., Eto, M. et al. Co-infection of Staphylococcus aureus or Haemophilus paragallinarum exacerbates H9N2 influenza A virus infection in chickens. Arch Virol 149, 2095–2104 (2004). https://doi.org/10.1007/s00705-004-0372-1

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• Received: 01 March 2004

• Accepted: 24 May 2004

• Published: 15 July 2004

• Issue Date: November 2004

• DOI: https://doi.org/10.1007/s00705-004-0372-1

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