As in the previous cases, initial tests confirm that these samples do not contain the highly pathogenic H5N1 strain that has spread through birds in Asia, Europe and Africa. These samples were collected from apparently healthy Northern pintail ducks and initial test results indicate the presence of low pathogenic avian influenza
virus, which poses no threat to human health.
tests confirmed over the weekend that the bird flu discovered in wild ducks in Pennsylvania is a low pathogenic strain. The NVSL confirmed the presence of the “North American strain” of low pathogenic H5N1 avian influenza through virus isolation in one of the 15 samples collected from the wild mallards in Crawford County, Pennsylvania. Initial screening results announced on 2 September indicated that an H5N1 avian influenza subtype was present in the collected samples, but further testing was necessary to confirm pathogenicity.