Like other vaccines, Covid-19 vaccines aid in the development of immunity to the virus. All vaccines protect the body by creating antibodies that fight future viruses. The Pfizer-BioNTech Covid-19 vaccine and Moderna Covid-19 vaccine both use mRNA to stimulate the production of these antibodies.
Individuals can be infected with Covid-19 shortly before or after vaccination because it usually takes your body a few weeks to produce the protective antibodies.
After vaccination, side effects can occur. However, this usually means that the body is developing immunity.
- Centers for Disease Control and Prevention
Understanding How Covid-19 Vaccines Work
- College of Engineering
Video: How the Covid-19 vaccine is made and how it works