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https://arstechnica.com/science/2022/08/cdc-eases-covid-quarantine-distancing-advice-in-case-you-still-follow-those/

The US Centers for Disease Control and Prevention updated its pandemic guidance today, offering slightly looser recommendations that likely won't change much about how Americans handle the pandemic these days.

According to the updated guidance, people who are not up-to-date on their vaccinations—i.e., unvaccinated people or people who have not received the recommended number of boosters—no longer need to quarantine if they know they've been exposed to someone with COVID-19. Instead, if a not up-to-date person is exposed, the CDC now recommends they wear a mask for 10 days after the exposure and get tested for COVID-19 on day 5. Currently, roughly 68 percent of the US population is not up to date on their COVID-19 vaccination.
[...]
Currently, the CDC is reporting that 40 percent of US counties have high levels of COVID-19 Community Levels and should therefore require masking in public indoor settings. Nearly 94 percent of counties, meanwhile, have high COVID-19 transmission levels, according to the latest CDC data.

COVID-19 Community Levels (Looks somewhat similar to a population density map.)