E China's Lu'an conducts 2nd round of nucleic acid testing

A medical worker collects a swab sample of a student for nucleic acid testing at a primary school in Lu'an, east China's Anhui Province, May 17, 2021. 

Aerial photo taken on May 17, 2021 shows medical workers collecting swab samples of students for nucleic acid testing at a primary school in Lu'an, east China's Anhui Province.

A medical worker collects a swab sample of a student for nucleic acid testing at a primary school in Lu'an, east China's Anhui Province, May 17, 2021.

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