Transmission of Equine Influenza Virus to Dogs

Author:

Crawford P. C.12345,Dubovi Edward J.12345,Castleman William L.12345,Stephenson Iain12345,Gibbs E. P. J.12345,Chen Limei12345,Smith Catherine12345,Hill Richard C.12345,Ferro Pamela12345,Pompey Justine12345,Bright Rick A.12345,Medina Marie-Jo12345,Johnson Calvin M.12345,Olsen Christopher W.12345,Cox Nancy J.12345,Klimov Alexander I.12345,Katz Jacqueline M.12345,Donis Ruben O.12345,

Affiliation:

1. College of Veterinary Medicine, University of Florida, Gainesville, FL 32611, USA.

2. College of Veterinary Medicine, Cornell University, Ithaca, NY 18453, USA.

3. Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.

4. College of Veterinary Medicine, Texas A&M University, College Station, TX 77841–3040, USA.

5. College of Veterinary Medicine, Auburn University, Auburn, AL 36849–5519, USA.

Abstract

Molecular and antigenic analyses of three influenza viruses isolated from outbreaks of severe respiratory disease in racing greyhounds revealed that they are closely related to H3N8 equine influenza virus. Phylogenetic analysis indicated that the canine influenza virus genomes form a monophyletic group, consistent with a single interspecies virus transfer. Molecular changes in the hemagglutinin suggested adaptive evolution in the new host. The etiologic role of this virus in respiratory disease was supported by the temporal association of rising antibody titers with disease and by experimental inoculation studies. The geographic expansion of the infection and its persistence for several years indicate efficient transmission of canine influenza virus among greyhounds. Evidence of infection in pet dogs suggests that this infection may also become enzootic in this population.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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