It's unclear how a Missouri resident was infected with H5N1. They were hospitalized but have recovered.

New test results suggest Missouri did not see a cluster of bird flu cases, a possibility that some experts had feared.

A third close contact of a patient in Missouri who was hospitalized with H5N1 bird flu has reported that they also experienced symptoms, the US Centers for Disease Control and Prevention said Friday.

Bird flu did not spread between humans in Missouri, tests show The case concerned health officials and experts because human-to-human transmission of the H5N1 strain of avian influenza could mark ...

There's no evidence of human-to-human transmission of H5N1 bird flu among patients and healthcare workers in Missouri, the CDC said during a press briefing today.

A second health worker who cared for a person hospitalized in Missouri with H5N1 bird flu developed mild respiratory symptoms but was not tested for influenza, the CDC reported.

A person in Missouri caught a bird flu virus similar to the strain circulating in cattle around the US. Experts are working to establish whether or not it was spread from human-to-human.

A patient in Missouri who was hospitalized after an infection with bird flu had the H5N1 strain of the virus, the US Centers for Disease Control and Prevention confirmed Friday.

Missouri bird flu patient didn't spread the virus to others, CDC says Even as cases of H5N1 virus among animals and people are rising in the U.S., there's no evidence of human-to-human transmission.

Missouri then forwarded the specimen to CDC which confirmed H5N1. This represents the first detection of H5N1 by the influenza surveillance system in place in the 50 states and federally in the U.S.

The hospitalized patient in Missouri had been tested for influenza as part of routine surveillance and turned out to be positive for H5N1, the bird flu virus.

The bird flu situation in the United States has evolved rapidly since April, when news about the virus infecting dairy cows made headlines. Here's what you need to know about the latest developments.