https://www.npr.org/2021/05/13/996582891/fully-vaccinated-people-can-stop-wearing-masks-indoors-and-outdoors-cdc-says
Key Things to Know About COVID-19 Vaccines.
https://www.cdc.gov/coronavirus/2019-ncov/vaccines/keythingstoknow.html
What We Are Still Learning
-We are still learning how well vaccines prevent you from spreading the virus that causes COVID-19 to others, even if you do not have symptoms. Early data show that vaccines help keep people with no symptoms from spreading COVID-19.
-We are also still learning how long COVID-19 vaccines protect people.
-We are still learning how many people have to be vaccinated against COVID-19 before the population can be considered protected (population immunity).
-We are still learning how effective the vaccines are against new variants of the virus that causes COVID-19.
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