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The Centers for Disease Control and Prevention has unveiled guidelines explaining which activities are safe to resume for Americans who have been fully vaccinated against COVID-19.

The CDC on Monday released interim recommendations explaining that those who have been fully vaccinated can visit with others who have been fully vaccinated "indoors without wearing masks or physical distancing." A person is considered fully vaccinated two weeks after they've received a second dose of the Pfizer or Moderna vaccine or two weeks after receiving one dose of Johnson & Johnson's vaccine.

Additionally, fully vaccinated people can "visit with unvaccinated people from a single household who are at low risk for severe COVID-19 disease indoors without wearing masks or physical distancing," the CDC said. As an example, CDC director Rochelle Walensky said in a briefing that "if grandparents have been vaccinated, they can visit their daughter and her family, even if they have not been vaccinated, so long as the daughter and her family are not at risk for severe disease."

The CDC also said that those who have been fully vaccinated can refrain from quarantining and getting tested should they become exposed to COVID-19 and not have any symptoms.

However, the CDC said that fully vaccinated people should still continue to practice social distancing and wear masks in public, and they should also avoid medium or large gatherings. Plus, fully vaccinated people should still wear masks and practice social distancing around unvaccinated people at high risk for COVID-19.

Walensky called these guidelines an "important first step in our efforts to resume everyday activities," while warning there's still a "small risk" vaccinated people "could become infected with milder or asymptomatic disease and potentially even transmit the virus to others who are not vaccinated."