Xinhua News Agency says two people are being detained for five days for writing on their microblogs that the H7N9 virus had been detected in a live poultry market in Guizhou province. The report says their message was reposted many times, causing fear to local people.
Xinhua says a third person actively participated in spreading the rumour and is being detained for 10 days.
China has reported 28 cases of people having being infected with the virus, and nine of these have died. All cases have been reported in Shanghai and eastern provinces.