According to the CDC, symptoms of Bird Flu include eye redness, upper respiratory symptoms, pneumonia that requires hospitalization, a fever of 100ºF or higher, a cough, sore throat, runny nose, muscle and/or body aches, headaches, fatigue and/or difficulty breathing. The CDC also notes that having a fever is not always present.

The U.S. Centers for Disease Control and Prevention says a patient has been hospitalized with a severe case of H5N1 infection in Louisiana, making it the first instance of a severe illness linked to the virus in the United States.

Bird flu virus has swept through farms across the nation’s largest dairy producing state. All human cases had been mild - until now.