U.S. health officials have run into obstacles in their efforts to determine whether a Missouri person infected with H5N1 bird flu passed the virus on to others.

So far, there have been 14 human cases of bird flu this year. All the patients — except the one from Missouri — had been linked to sick dairy cows or poultry.

Why fears of human-to-human bird flu spread in Missouri are overblown Hospital workers reported respiratory symptoms after encountering a Missouri patient with H5N1 who had not been exposed to ...

Missouri’s first human case of the bird flu was announced Sept. 9, and it struck experts as unusual because the patient reported no recent exposure to livestock or other animals.

Missouri bird flu case raises questions for scientists A week after an unusual human case of H5 avian influenza was reported in Missouri, many questions remain. The latest on what's known -- and ...

A hospitalized patient in Missouri was infected with bird flu despite having had no known contact with dairy cows or other animals associated with an ongoing outbreak, health officials said Friday.

Missouri State Epidemiologist George Turabelidze, facing mounting pressure from health experts to be more transparent while investigating the state's first bird flu case, recently gave an ...

An individual in Missouri has contracted bird flu, the first human infection unconnected to farm work in an outbreak detected in the spring when the disease was discovered among dairy cows.

An injured seven-pound bald eagle is being treated at the World Bird Sanctuary in Valley Park, Missouri, after it was shot. It is also suffering from lead poisoning.

The Missouri case raised questions about the possibility of human-to-human bird flu transmission, but officials said there is no evidence of other people being infected. “Right now, evidence points to ...

A Missouri resident has tested positive for bird flu even though there is no evidence the person came into contact with an animal infected with the virus, the Centers for Disease Control and ...

A person in Missouri has been diagnosed with bird flu — despite never coming into contact with any animals, the Centers for Disease Control and Prevention announced on Friday.