The Chinese mainland recorded 37 confirmed COVID-19 cases on Thursday, with 18 linked to local transmissions and 19 from overseas, data from the National Health Commission showed on Friday.

Sales of Juul e-cigarettes were blocked by the U.S. Food and Drug Administration on Thursday, in a major blow to the once high-flying firm whose products have been tied to a surge in teenage vaping.

COVID-19 vaccines that specifically target the Omicron and other variants are under development, Pfizer Inc's chief executive said on Wednesday, adding that the company will be able to quickly adapt shots as the novel coronavirus mutates.

Nearly 1 in 5 American adults who reported having COVID-19 in the past are still having symptoms of long COVID, according to survey data collected in the first two weeks of June, U.S. health officials said on Wednesday.

The Biden administration plans to propose a rule to establish a maximum nicotine level in cigarettes and other finished tobacco products in an attempt to make them less addictive, the White House Budget Office said Tuesday.

The Chinese mainland recorded 31 confirmed COVID-19 cases on Tuesday, with 10 linked to local transmissions and 21 from overseas, data from the National Health Commission showed on Wednesday.

People infected with the earliest version of the Omicron variant of the coronavirus, first identified in South Africa in November, may be vulnerable to reinfection with later versions of Omicron even if they have been vaccinated and boosted, new findings suggest.