A massive supply of vaccines has been sent to the earthquake disaster zone to prevent a possible epidemic, but authorities say no major outbreak has occurred so far.
Ministry of Health spokesman Sun Jiahai said the authorities planned to finish hepatitis A and encephalitis B vaccinations for high-risk groups by the middle of next month, and to stock up on 100,000 vaccines against cholera, 20,000 against rabies and 30,000 for measles, mumps and rubella.
Qi Xiaoqiu, director of disease prevention and control at the Health Ministry, said no epidemics had broken out so far, but there were increasing reports of fever and diarrhoea.
Mr Qi said survivors were vulnerable to diseases due to poor hygiene, the hot weather and their weakened immunity.
'The immune systems of the local people have been weakened, so they will become more vulnerable to epidemics,' he warned.
Mr Sun said the government had sent 91,298 medical personnel to the region for disease monitoring and control, and all counties, towns and villages had received medical relief.
That statement was contradicted, however, by reports that some villages were still inaccessible.