The protection someone gains from having an infection (called natural immunity) varies depending on the disease, and it varies from person to person. Since this virus is new, we don’t know how long natural immunity might last. Some early evidence—based on some people— seems to suggest that natural immunity may not last very long.
Regarding vaccination, we won’t know how long immunity lasts until we have a vaccine and more data on how well it works.
Both natural immunity and vaccine-induced immunity are important aspects of COVID-19 that experts are trying to learn more about. The CDC will provide updated information as new evidence becomes available and the Health District will continue to keep the public informed.