With cold and flu season approaching, it’s worth knowing about another virus out there—albeit extremely rare: bird flu. Like the regular flu, bird flu virus symptoms include fever, cough and a sore throat.

An extensive look at wastewater samples taken across the United States from May to July found traces of the H5N1 bird flu popping up -- but only in areas populated by farm animals.

Several labs will work with federal health authorities to develop a test for avian influenza, as the number of human cases rise across the country.