Unsettling news emerged from Missouri in late September. Six health care workers in the state developed mild respiratory symptoms after caring for a somewhat high-profile patient—the first person to have caught bird flu despite having no known contact with infected animals. The fear was that the virus could be spreading from person to person.
The Centers for Disease Control and Prevention emphasize that so far only the original patient has tested positive for bird flu, however; one of the workers has tested negative for the virus, while the others were not tested and have provided blood samples for further analysis.
This kind of bird flu is caused by the H5N1 virus,