Bird flu: What we know (and don’t) about its potential to cause a human pandemic

Here’s what’s worrying experts right now about H5N1’s spread among dairy cows — and what isn’t.

A dairy farm worker prepares cows for milking in Ontario, Canada, in July 2022.Irfan Khan/Los Angeles Times via Getty Images

Keren Landman, MD is a senior reporter covering public health, emerging infectious diseases, the health workforce, and health justice at Vox.