NEW YORK (AP) The nations top public health agency on Thursday relaxed its COVID-19 guidelines, dropping the recommendation that Americans quarantine themselves if they come into close contact with an infected person.

The Centers for Disease Control and Prevention also said people no longer need to stay at least 6 feet away from others.

The changes are driven by a recognition that more than 2 1/2 years since the start of the pandemic an estimated 95% of Americans 16 and older have acquired some level of immunity, either from being vaccinated or infected, agency officials said.

The current conditions of this pandemic are very different from those of the last two years, said the CDCs Greta Massetti, an author of the guidelines.

The CDC recommendations apply to everyone in the U.S., but the changes could be particularly important for schools, which resume classes this month in many parts of the country.

Perhaps the biggest education-related change is the end of the recommendation that schools do routine daily testing, although that practice can be reinstated in certain situations during a surge in infections, officials said.

The CDC also dropped a test-to-stay recommendation, which said students exposed to COVID-19 could regularly test instead of quarantining at home to keep attending school. With no quarantine recommendation anymore, the testing option disappeared too.

Masks continue to be recommended only in areas where community transmission is deemed high, or if a person is considered at high risk of severe illness.