![](http://www.ecns.cn/hd/2022/05/16/788914e2a1534401a6dfd3e8acb7b18f.jpg)
Medical workers take swab samples from residents for nucleic acid testing at Sanlitun area, Chaoyang district, Beijing, May 15, 2022. (Photo: China News Service/Jia Tianyong)
Twelve districts in Beijing will continue to carry out three rounds of daily nucleic acid screening from Monday to Wednesday to curb the spread of the COVID-19 outbreak.
![](http://www.ecns.cn/hd/2022/05/16/4f7e6b06bf4349cd8b3eafdb3ef8dc33.jpg)
A medical worker takes a swab sample from a woman for nucleic acid test at Sanlitun area, Chaoyang district, Beijing, May 15, 2022. (Photo: China News Service/Jia Tianyong)
![](http://www.ecns.cn/hd/2022/05/16/6d0feb18277e459bb1935c07df9f3289.jpg)
A medical staff member helps foreign nationals register information for nucleic acid testing at Sanlitun area, Chaoyang district, Beijing, May 15, 2022. (Photo: China News Service/Jia Tianyong)
![](http://www.ecns.cn/hd/2022/05/16/a02deefd987541e28695c7e2a0c73c31.jpg)
A man undergoes nucleic acid testing at Sanlitun, Chaoyang district, Beijing, May 15, 2022. (Photo: China News Service/Jia Tianyong)