Influenza A pandemic (H1N1) 2009 virus infection in domestic cat

DOI: 10.3201/eid1603.091737
Suggested citation for this article: Sponseller BA, Strait E, Jergens A, Trujillo J, Harmon K, Koster L, et al. Influenza A pandemic (H1N1) 2009 virus infection in domestic cat. Emerg Infect Dis. 2010 Mar; [Epub ahead of print]

Influenza A Pandemic (H1N1) 2009 Virus Infection in Domestic Cat

Brett A. Sponseller, Erin Strait, Albert Jergens, Jessie Trujillo, Karen Harmon, Leo Koster, Melinda Jenkins-Moore, Mary Killian, Sabrina Swenson, Holly Bender, Ken Waller, Kristina Miles, Tracy Pearce, Kyoung-Jin Yoon, and Peter Nara

Author affiliations: Iowa State University, Ames, Iowa, USA (B. A. Sponseller, E. Strait, A. Jergens, J. Trujillo, K. Harmon, H. Bender, K. Waller, K. Miles, T. Pearce, K.-Y. Yoon, P. Nara); and US Department of Agriculture National Veterinary Services Laboratories, Ames (L. Koster, M. Jenkins-Moore, M. Killian, S. Swenson)

Influenza A pandemic (H1N1) 2009 virus continues to rapidly spread worldwide. In 2009, pandemic (H1N1) 2009 infection in a domestic cat from Iowa was diagnosed by a novel PCR assay that distinguishes between Eurasian and North American pandemic (H1N1) 2009 virus matrix genes. Human-to-cat transmission is presumed.

Influenza viruses are typically host specific; aquatic birds are considered the primary reservoir. However, interspecies transmission does occur (1–9) and occasionally leads to novel host-adapted strains. Interspecies transmission of influenza virus has been a public health concern because of the possibility that, through reassortment, a novel strain with zoonotic potential could emerge. The recent infection of dogs with equine influenza virus (H3N8) (2) and of swine with human influenza virus (H1N2) (4) are particularly intriguing because the former resulted in influenza becoming endemic in dogs and the latter resulted in a documented reassortment event between human and swine influenza viruses. Such concern has escalated with the recent emergence of the novel quadruple-reassorted influenza virus (H1N1) [pandemic (H1N1) 2009] in humans (10). Although infection and transmission of the virus have occurred primarily among humans, occasional transmission from infected persons to susceptible animals...

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