Officials with the National Health Commission in China have reported the first human case of avian influenza A(H7N9) this year in Gansu.
The male patient from Jiuquan, aged 82, has been hospitalized and is in serious condition.
Since March 2013, there were a total of 1568 human cases of avian influenza A(H7N9) reported globally (in the past six waves).
Avian influenza is caused by those influenza viruses that mainly affect birds and poultry, such as chickens or ducks. Clinical presentation of avian influenza in humans may range from flu-like symptoms (e.g. fever, cough, sore throat, muscle aches) to severe respiratory illness (e.g. chest infection). Eye infection (conjunctivitis) and gastrointestinal symptoms (e.g. nausea, vomiting and diarrhea) have also been reported.
The incubation period ranges from 7 to 10 days. The more virulent forms can result in respiratory failure, multi-organ failure and even death. People mainly become infected with avian influenza virus through contact with infected birds and poultry (live or dead) or their droppings, or contact with contaminated environments (such as wet markets and live poultry markets). Human-to-human transmission is inefficient. People in close contact with poultry are more susceptible to contracting avian influenza.
The elderly, children and people with chronic illness have a higher risk of developing complications such as bronchitis and chest infection.
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