You can get COVID-19 again as soon as several weeks after a previous infection, although this is rare. Reinfection can occur because new variants of the virus may evade immunity gained from prior infection or vaccination
. Typically, most reinfections happen after about 90 days or more, with data showing reinfections ranging from 90 to 650 days after the initial infection, and most occurring after about one year
. However, some people, especially those with weakened immune systems, may be at higher risk of reinfection within a shorter time frame
. Immunity from a COVID-19 infection generally wanes after 3-4 months, which can increase susceptibility to reinfection, especially with new variants like Omicron that can bypass immune defenses
. Reinfections tend to be milder but can still cause illness
. In summary:
- Reinfection can happen as soon as several weeks post-infection but is uncommon.
- Most reinfections occur after 90 days or more.
- Immunity wanes after a few months, and new variants increase reinfection risk.
- People with weakened immune systems are more vulnerable to early reinfection.
Vaccination remains the best protection against severe illness and reinfection
