cnn:cdc指出年轻人可能成为家庭和社区聚集感染的感染源_风闻

又一项重大发现

CDC: Young adults may be the sparks in hotspots

Meanwhile, CDC researchers say young adults may be the sparks that set off new hotspots of Covid-19 spread.

The researchers found the percentage of positive Covid-19 test results start going up among people under the age of 25 about a month before a county is designated as a hotspot.

Percent positivity in younger persons was followed by increasing positivity among older age groups, the researchers wrote.

Other experts have previously said that could be the case. Over the summer, Birx said parts of the country were seeing a “household” spread: younger people were contracting the virus and unknowingly (as many often can have mild or no symptoms) brought it back home to their parents, who then passed the virus on to other members of the family and community.

With holidays like Thanksgiving on the horizon, Birx urged residents on Friday not to let their guard down and said it was important for college students returning home to remain diligent about taking health precautions and encouraging their communities to do the same.