While cases are rising, with over 100 herds affected nationwide, scientists worry that not enough testing is being done to understand the outbreak’s full scope. Florida has yet to record a case in cows. Michigan has reported the most of any state, with infections logged in 25 herds.

What is bird flu? High pathogenic avian influenza is a highly contagious disease for poultry, hence the name avian referring to birds. Detections for bird flu in poultry flocks are more common in the spring and fall because wild birds spread the virus through migration,