Flu

The U.S. is currently experiencing very high levels of seasonal influenza across the country. Here's why.

A branch of the H5N1 bird flu family tree that hadn't previously been seen in cattle has now been detected in dairy cows.

Nearly 119,000 birds have been culled at a farm in California after a bird flu called H5N9 was detected among the poultry.

The patient in Louisiana who contracted a severe case of bird flu has died, officials announced.

The Los Angeles County Department of Public Health has warned that raw pet food products have tested positive for bird flu and sickened pet cats in the area.

The declaration of a state of emergency in California over avian influenza comes within days of the first severe human case of bird flu in the U.S.

A person in Louisiana has been hospitalized with the United States' first serious case of H5N1 bird flu, following 60 milder cases this year.

A new federal order requires that U.S. dairies provide milk samples to the USDA so the agency can test the milk for bird flu prior to pasteurization.

A new laboratory study pinpoints a way H5N1 could evolve to spread from person to person.

The vast majority of human cases of H5N1 bird flu in the U.S. have resulted from direct contact with animals, so a few simple precautions can keep most people's risk very low.