Tests confirm low-pathogenic H5N1 in US swans
The US Department of Agriculture has announced final test results,
which confirm that an H5N1 avian influenza virus detected in samples collected
earlier this month from two Michigan wild mute swans is a low pathogenic
The USDA says that this
strain has been detected several times in wild birds in North America and poses
no threat to human health.
The USDA National Veterinary Services Laboratories (NVSL) confirmed the
presence of the "North American strain" of low pathogenic H5N1 avian
influenza in one of twenty samples collected from the two wild mute
Preliminary test results announced on August 14 indicated that an H5N1 strain
could be present in two of the collected samples. Only one of the samples
contained high enough levels of the virus to conduct confirmatory testing.
Genetic testing ruled out the possibility that either of the samples carried the
highly pathogenic strain of H5N1 avian influenza that is circulating
The USDA says that low pathogenic strains of avian influenza commonly occur
in wild birds and typically cause only minor sickness or no noticeable signs of
disease in birds. Low pathogenic H5N1 is very different from the more severe
highly pathogenic H5N1 circulating in parts of Asia, Europe and Africa. Highly
pathogenic strains of avian influenza spread rapidly and are often fatal to
chickens and turkeys.
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