The Vaccine
COVID-19 vaccines teach our immune systems how to recognize and fight the virus that causes COVID-19. It typically takes two weeks after vaccination for the body to build protection (immunity) against the virus that causes COVID-19. That means it is possible a person could still get COVID-19 before or just after vaccination and then get sick because the vaccine did not have enough time to provide protection. People are considered fully protected two weeks after their second dose of the Pfizer-BioNTech or Moderna COVID-19 vaccine, or two weeks after the single-dose Johnson & Johnson’s Janssen COVID-19 vaccine.
Source: https://www.cdc.gov/coronavirus/2019-ncov/vaccines/faq.html
Comparison of Different Vaccines

Possible Side Effects
After getting a COVID-19 vaccine, you might have side effects. This often means the vaccine is working. The vaccine is still working even if you don’t have side effects. Most of the side effects should go away in a few days.
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Cost of COVID Vaccine
The federal government is providing the vaccine at no cost. The pharmacy or clinic that administers the vaccine will bill the administration fee to private insurance or the federal government. No fee will be billed to the COVID vaccine recipient.