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Updated H1 nomenclature

SIV H1 cluster* nomenclature has been updated in recent years. Throughout this website, Zoetis uses the following updated terminology.

* Within each of these clusters, H1 viruses can be either H1N1 or H1N2 viruses.

1. Data on file, Study Report No. 3121R-60-09-792, Zoetis Inc.