| evolution of a reassortant north american gull influenza virus lineage: drift, shift and stability. | the role of gulls in the ecology of avian influenza (ai) is different than that of waterfowl. different constellations of subtypes circulate within the two groups of birds and ai viruses isolated from north american gulls frequently possess reassortant genomes with genetic elements from both north america and eurasian lineages. a 2008 isolate from a newfoundland great black-backed gull contained a mix of north american waterfowl, north american gull and eurasian lineage genes. | 2013 | 23742717 |