Different strains of avian influenza can lead to different
symptoms in people. All strains can cause symptoms typical
of human influenza (fever, cough, tiredness, muscle aches,
sore throat, shortness of breath, runny nose, headache). In
some cases the H5N1 strain has caused a severe pneumonia
and, in a small number of cases, encephalitis (inflammation
of the brain) or diarrhoea. The most common symptom
of humans infected with H7 strains of avian influenza
is conjunctivitis (inflammation of the lining of the eye).
Symptoms generally appear between two to four days
following exposure.
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