A military hygiene staffer sprays disinfectants to students' book-bags grabed from crumbled debris, during a comprehensive anti-epidemics operation, at Hongbai Township, Shifang City, southwest China's Sichuan Province, May 20, 2008. Beginning on Monday, the Ministry of Health dispatch 500 more health and epidemic prevention workers each day for five days to the quake-ridden areas, and 1,000 health supervisors would be deployed by May 23, and no major outbreak of epidemic diseases or other public health threats had been reported in the quake-stricken areas as of 9 p.m. Monday.