Residents take nucleic acid tests at a testing site in Wuhan, Central China's Hubei province, May 15, 2020. [Photo/Xinhua]

WUHAN -- The last three asymptomatic cases in Wuhan, once hit hard by the COVID-19 epidemic, were released from medical observation on June 15 after they turned negative in nucleic acid tests.

Wuhan's health commission said June 16 that the city had no asymptomatic cases as of Monday, and there are no more close contacts under medical observation.