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Journal of Clinical Microbiology, March 2002, p. 1073-1079, Vol. 40, No. 3
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.3.1073-1079.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Genetic Characterization of H1N2 Influenza A Viruses Isolated from Pigs throughout the United States

Alexander I. Karasin,1 John Landgraf,2 Sabrina Swenson,2 Gene Erickson,3 Sagar Goyal,4 Mary Woodruff,5 Gail Scherba,6 Gary Anderson,7 and Christopher W. Olsen1*

Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin—Madison, Madison, Wisconsin,1 National Veterinary Services Laboratories, United States Department of Agriculture, Ames, Iowa,2 Rollins Animal Disease Diagnostic Laboratory, Raleigh, North Carolina,3 Department of Veterinary Diagnostic Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota,4 Animal Disease Diagnostic Laboratory, School of Veterinary Medicine, Purdue University, West Lafayette, Indiana,5 Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana—Champaign, Champaign, Illinois,6 ImmTech Biologics, LLC, Bucyrus, Kansas7

Received 30 August 2001/ Returned for modification 29 November 2001/ Accepted 30 December 2001

An H1N2 influenza A virus was isolated from a pig in the United States for the first time in 1999 (A. I. Karasin, G. A. Anderson, and C. W. Olsen, J. Clin. Microbiol. 38:2453-2456, 2000). H1N2 viruses have been isolated subsequently from pigs in many states. Phylogenetic analyses of eight such viruses isolated from pigs in Indiana, Illinois, Minnesota, Ohio, Iowa, and North Carolina during 2000 to 2001 showed that these viruses are all of the same reassortant genotype as that of the initial H1N2 isolate from 1999.

* Corresponding author. Mailing address: Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin—Madison, 2015 Linden Dr., Madison, WI 53706. Phone: (608) 265-8681. Fax: (608) 263-0438. E-mail: olsenc{at}svm.vetmed.wisc.edu.

Journal of Clinical Microbiology, March 2002, p. 1073-1079, Vol. 40, No. 3
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.3.1073-1079.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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