Whoever posted this on Bluesky is ludicrously incorrect. There are around 732 affected herds in California, but California has 11,000 herds. That’s 6.65%.
Also, the presentation is highly misleading. Only one cow in a herd needs to be infected with H5N1 for the herd to be “affected”. There are 1.75 million cattle in California. As little as 0.04% of California’s cattle stock could be affected.
Further, H5N1 doesn’t cause serious illness in cows, just 7-10 days of minor symptoms. We don’t even know that cows can spread it to each other.
Honestly not the worst thing that could happen at this point.