There are three different types of antibodies: IgM, IgG, and IgA.
- Immunoglobulin M (IgM) is produced as the body’s first response to a COVID-19 infection. Generally, IgM may provide short-term protection and can help tell if an individual has been recently infected.
- Immunoglobulin G (IgG) is the most common type of antibody. It’s made several days to weeks after being exposed to COVID-19. Generally, IgG remains in the body and may provide long-term protection against future exposure.
- Immunoglobulin A (IgA) is found in the blood, sinuses, lungs, and stomach. Generally, IgA helps protect these areas from infection. However, the role of these antibodies in determining exposure or immunity is unknown.
There is not enough evidence at this time to suggest that people who have these antibodies are protected against future COVID-19 infections.