Ben Madilynn
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Recent testing of wastewater samples across the United States from May to July has revealed the presence of H5N1 bird flu, but only in areas with significant farm animal populations. This avian flu strain has been a growing concern, particularly in U.S. poultry and dairy herds, sparking fears that it could eventually mutate and spread among humans. However, current testing indicates that the virus remains largely contained to animals.
According to the Centers for Disease Control and Prevention (CDC), wastewater testing between May 12 and July 13 showed traces of the H5N1 virus in nine states: California, Colorado, Idaho, Iowa, Michigan, Minnesota, North Carolina, South Dakota, and Texas. The majority of these states had previously reported infected livestock or poultry, confirming the virus is still primarily circulating within animal populations.
Human cases of H5N1 remain rare, with only 14 reported infections to date, most involving individuals in close contact with infected animals, such as dairy workers. Two of the nine states that detected H5N1 in wastewater—Colorado and Michigan—also reported confirmed human infections during the testing period, but these cases were traced back to animal-related sources.
Despite these findings, the CDC emphasized that wastewater testing is not yet advanced enough to reliably distinguish between animal and human sources of the virus. While the technology holds promise, more precise methods are needed to determine the exact origin of detected viral particles.
The report also examined broader influenza A activity, which includes seasonal flu strains. In four states—California, Illinois, Kansas, and Oregon—high levels of influenza A virus were found in wastewater, but there were no associated H5N1 infections in humans or animals in those areas. This suggests that regular human flu, not bird flu, was circulating during the early summer months in those regions.
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