- It’s too early to know if COVID-19 vaccines will provide long-term protection. Added research is needed to answer this question. However, it’s encouraging that available data suggest that most people who recover from COVID-19 develop an immune response that provides at least some protection against reinfection – although we’re still learning how strong this protection is, and how long it lasts.
It’s also not yet clear how many doses of a COVID-19 vaccine will be needed. Early data from clinical trials indicate that some vaccines will require two doses.