Influenza is a contagious respiratory illness. It is characterized by a sudden onset of fever, headache, myalgia, malaise, prostration, non-productive cough, sore throat, and rhinitis. It has usually a short incubation period, from one to three days.

Most people recover within one to two weeks without any medical treatment. However, severe illness and death during annual influenza epidemics occur primarily among the very young, the elderly and those with other serious medical conditions.

There are three types of seasonal influenza – A, B and C. Among many subtypes of influenza A viruses, currently influenza A(H1N1) and A(H3N2) subtypes are circulating among humans. Type C influenza cases occur much less frequently than A and B. That is why only influenza A and B viruses are included in seasonal influenza vaccines.

Seasonal Influenza is in the list of category C of notifiable diseases to be reported according to the Law of Communicable Diseases Prevention and Control of China.

WHO work in China

China-WHO Country Cooperation Strategy 2016-2020

WHO China Office-New space for health

Contact information

World Health Organization China Representative Office
401 Dongwai Diplomatic Building,
23 Dongzhimenwai Dajie,
Chaoyang District,
Beijing 100600, PR China
Telephone: +86 10 6532-7189 / 90 / 91 / 92
Fax: +86 10 6532-2359