Bird flu, also known as the H5N1 virus, has infected cattle in nine states, according to data from the Centers for Disease Control and Prevention (CDC).
To track the spread of the disease, the CDC has begun reporting wastewater data.
Although it has affected millions of birds and other animals in the last 2 years, its risk to humans is still considered low. Just one person in the U.S. has developed H5N1 in recent months.
