A new version of the virus is widespread in wild birds but had not previously been detected in cows.

In recent months, bird flu has started raising red flags among scientists and public health officials. Apoorva Mandavilli, a New York Times reporter who covers infectious diseases, explains why we need to start taking bird flu seriously.

A pandemic is not inevitable, scientists say. But the outbreak has passed worrisome milestones in recent weeks, including cattle that may have been reinfected.

The cases have spurred new pet food safety rules and poultry surveillance efforts.

The deceased was over 65 and had other medical conditions, state officials said.