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Bird flu may also cause an eye infection (conjunctivitis). But bird flu can quickly progress to pneumonia and acute respiratory distress syndrome, a serious lung problem that can be deadly. For the people who die from bird flu, the average length of time from the start of symptoms until death is 9 to 10 days.
The flu usually starts suddenly and may include these symptoms: 1  Fever* or feeling feverish/chills. 2  Cough. 3  Sore throat. 4  Runny or stuffy nose. 5  Muscle or body aches. 6  Headaches. 7  Fatigue (tiredness). 8  Some people may have vomiting and diarrhea, though this is more common in children than adults.