Staff members do a test at a laboratory of the regional disease prevention and control center in Lhasa, southwest China's Tibet Autonomous Region, March 23, 2018. Tibet has completed the screening of hydatid disease by the end of November, 2017. The disease database has been improved by adding rheumatism, AIDS, tuberculosis and other diseases to it. (Xinhua/Jigme Dorje)

Staff members do a test at a laboratory of the regional disease prevention and control center in Lhasa, southwest China's Tibet Autonomous Region, March 23, 2018. Tibet has completed the screening of hydatid disease by the end of November, 2017. The disease database has been improved by adding rheumatism, AIDS, tuberculosis and other diseases to it. (Xinhua/Jigme Dorje)

Staff members do an experiment at a laboratory of the regional disease prevention and control center in Lhasa, southwest China's Tibet Autonomous Region, March 23, 2018. Tibet has completed the screening of hydatid disease by the end of November, 2017. The disease database has been improved by adding rheumatism, AIDS, tuberculosis and other diseases to it. (Xinhua/Jigme Dorje)

Staff members do a test at a laboratory of the regional disease prevention and control center in Lhasa, southwest China's Tibet Autonomous Region, March 23, 2018. Tibet has completed the screening of hydatid disease by the end of November, 2017. The disease database has been improved by adding rheumatism, AIDS, tuberculosis and other diseases to it. (Xinhua/Jigme Dorje)

A staff member does a test at a laboratory of the regional disease prevention and control center in Lhasa, southwest China's Tibet Autonomous Region, March 23, 2018. Tibet has completed the screening of hydatid disease by the end of November, 2017. The disease database has been improved by adding rheumatism, AIDS, tuberculosis and other diseases to it. (Xinhua/Jigme Dorje)