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BEIJING, April 18 (Xinhua) -- China has strengthened nucleic acid testing of travelers leaving Wuhan, a city hit hard by COVID-19, before they resume work, production or study elsewhere, according to a recently released circular.

Yuan said "malicious" claims about the lab had been "pulled out of thin air" and contradicted all available evidence. "The WIV does not have the intention and the ability to design and construct a new coronavirus," and "there is no information within the SARS-CoV-2 genome indicating it was man-made," he told Reuters.

The epidemic prevention and control work in Beijing should be further strengthened, while targeted measures should be taken across the country to guard against rebounds in cases, according to the meeting.

These officials planted 2,050 saplings in a green space in Beijing's sub-center in the eastern Tongzhou District.

A list of medical institutes was designated to provide maternal care services for pregnant women without coronavirus, according to Guo.