If you've already had COVID-19, your natural antibodies may last as long as 20 months, a new study suggests. While this is reassuring, experts are quick to caution that the new findings don't necessarily mean you're protected against reinfection, and that vaccines remain an important part of a COVID-19 prevention strategy. In a study of unvaccinated US adults up to 20 months, antibodies were detected in 99% of people who ...