Antiviral Susceptibility of Highly Pathogenic Avian Influenza A(H5N1) Viruses Isolated from Poultry, Vietnam, 2009–2011
We assessed drug susceptibilities of 125 avian influenza A(H5N1) viruses isolated from poultry Posters in Vietnam during 2009–2011.Of 25 clade 1.1 viruses, all possessed a marker of resistance to M2 blockers amantadine and rimantadine; 24 were inhibited by neuraminidase inhibitors.One clade 1.1 virus contained the R430W neuraminidase gene and red