Figure 1. Geographic locations of avian fecal samples collected in the United States and HA sequences generated during USDA surveillance efforts from 2006 through 2007.

This map shows the total avian fecal samples collected across the United States and shows which of those samples were matrix positive and matrix negative. Of the matrix positive samples that we successfully sequenced we also show sampling localities and differentiate between sequences representing HA subtypes that have been previously documented in that state (HA sequences from the same subtype and state also found on NCBI Influenza Virus Resource during our searches) and those that were newly documented in that state through this study.