Canada’s got a serious problem - the US is not doing enough to control bird flu.

According to ProPublica’s Nat Lash:

The U.S. Department of Agriculture typically attributes bird flu outbreaks to failures of biosecurity — meaning farmers have not done enough to protect flocks from contamination by wild birds.

But my genomic analysis shows wild birds had little to do with this particular cluster of infections. Although the USDA said it tested nearly 1,000 virus samples in wild animals from December to April in Ohio and Indiana, no nearby wild birds were found infected with this outbreak’s strain.

I did find a strong predictor of infection during the first few weeks of this outbreak: whether a farm was downwind from that first contaminated facility. That pattern reinforced the suspicions of egg producers and some local officials that the virus may be spreading on the wind.

…

The USDA insisted that this particular outbreak was “unique” and “not representative” of the entire wave of bird flu that started in 2022, and that the “overwhelming majority” of infections stem from wild birds. The agency said its biosecurity strategy “remains rooted in real-time data, internationally recognized best practices and a commitment to transparency and continuous improvement,” and that it is “proactively assessing” the possibility of vaccinating poultry for bird flu.

Experts told me that understanding what drove this massive outbreak was important, and it didn’t seem like USDA was doing that work. The agency did not evaluate airborne transmission in this outbreak. It also doesn’t make it easy for others to do so, withholding key information that would allow journalists and researchers to evaluate the spread of the virus.

As infections surge again this fall, the USDA continues to urge farmers to improve biosecurity while it dismisses a significant way the virus could be spreading.