People who have a condition or are taking medications that weaken their immune system may not be fully protected even if they are fully vaccinated. In areas with high numbers of COVID-19 cases, consider wearing a mask in crowded outdoor settings and for activities with close contact with others who are not fully vaccinated. In general, you do not need to wear a mask in outdoor settings. If you are not fully vaccinated and aged 2 or older, you should wear a mask in indoor public places. If you are attending a gathering, think about the steps you need to take to protect yourself and your loved ones from COVID-19.