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"Family and friends may be asymptomatic and as we can see from Victoria, COVID-19 spreads at an exponential rate, particularly among close contacts," he said.

"Don't leave home without wearing a mask." An old woman in Caofangzi who went out without a mask was intercepted by a drone. She stared at the drone for several seconds and went back home obediently.

"Even though we have spent more than half a year battling a virus whose insidious hallmark is its ability to spread through those with no symptoms, the country has not yet articulated a coherent strategy to test these silent carriers," online media outlet ProPublica said.

"Enterprises, especially Chinese companies, will usher in a period … where difficulties and opportunities coexist after experiencing the pain of the epidemic and the rebound in the recovery period. China's success in fighting the epidemic has not been accidental. It has not only shown the success of the system and policies, but also reflects the persistence and innovation of the people," he said.

"Fever, cough, fatigue are the main symptoms of the novel coronavirus pneumonia patients, with majority of patients finding it difficult to breath one week after being confirmed having the disease. Severe patients would appear as having acute respiratory distress syndrome," said Li Xin, director of the respiration department with China Resource & WISCO General Hospital.