Why do vaccinated still wear masks?

That means fully immunized people with young children, aging parents, or friends and family with weak immune systems will need to renew vigilance, particularly in high-transmission communities. Vaccinated Americans may need to wear masks not just to protect themselves, but everyone in their orbit. no vaccine is 100% effective and, though rare, fully vaccinated people can contract coronavirus. These cases, known as breakthrough infections, can cause COVID-like symptoms — or no symptoms at al