There have been 61 confirmed cases of bird flu in the United States, including one 65-year-old Louisiana man who is hospitalized in critical condition from the illness.

Most human cases of bird flu, caused by avian influenza A(H5) virus, have been mild so far, and most were in people who had known exposure to sick or infected animals.

The severity of illness associated with bird flu has ranged from mild to severe, including death, according to the Centers for Disease Control and Infection. The reported signs and symptoms of bird flu in humans have varied. Eye redness has been the predominant symptom among recent U.S. cases. Respiratory symptoms and fever were also reported.

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