After you've been fully vaccinated against COVID-19, you should keep taking precautions—like wearing a mask, staying 6 feet apart from others, and avoiding crowds and poorly ventilated spaces—in public places until we know more.
When You've Been Fully Vaccinated | CDC
https://www.washingtonpost.com/health/2021/04/26/vaccinated-wear-a-mask/
https://www.seattletimes.com/nation-world/vaccinated-great-why-you-should-still-wear-a-mask-in-public/
4-26-2021
