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"It is necessary to take their temperatures and ask for their medical history because the first signs are not necessarily fever and respiratory symptoms," Luo explained. "It is also important to ask if they have fever, cough, fatigue and a lack of appetite."

Moreover, the WHO expert praised Chinese phenomenal collective action, stressing "it's never easy to get the kind of passion, commitment, interest and individual sense of duty that help stop the virus."

The country's environmental and agricultural regulators have jointly urged local authorities to standardize the zoning and management of pig breeding. To date, the ban on 14,000 areas has been lifted, said Liu Zhiquan, an official with the Ministry of Ecology and Environment.

It marked the first such train to bring people back to their workplaces in Wuhan since the outbreak.

XI'AN, April 23 (Xinhua) -- Xi Jinping, general secretary of the Communist Party of China Central Committee, on Wednesday visited an exhibition on the relocation of Jiaotong University from Shanghai to Xi'an and its development and achievements at the Xi'an Jiaotong University museum.