Vaccination is protecting us as individuals and as a community. Get answers to questions about getting the vaccine and tips for after vaccination.
This information has been reviewed and approved by Rosine Angbanzan, MPH (March 2022)
No! The vaccine cannot give you COVID-19. The Pfizer, Moderna and Johnson & Johnson vaccines do not contain the pieces needed to make more virus.
The U.S. Food and Drug Administration (FDA) and other agencies closely monitor vaccine development in clinical trials that evaluate both the safety and effectiveness of vaccines. In the Moderna and Pfizer vaccines, no significant side effects were seen beyond the expected flu-like symptoms. In extremely rare cases, thrombosis with thrombocytopenia syndrome (TTS) has affected recipients of the Johnson & Johnson vaccine, which is why the Moderna and Pfizer vaccines are preferred.
The Pfizer and Moderna vaccines are effective within approximately two to three weeks after completing the second dose. The Johnson & Johnson vaccine is fully effective within two weeks of the one required dose.
With tests indicating an effectiveness of approximately over 94%, the Moderna and Pfizer vaccines offer more protection against COVID-19 infection than the Johnson & Johnson shot (66% effective). However, due to the waning efficacy of the vaccines over time, and the influx of new variants, the Centers for Disease Control and Prevention (CDC) recommends getting a booster shot of the Pfizer and Moderna after five months.
Regardless of your vaccination status, social distancing remains an effective way to safeguard others from potential infection, especially in public spaces. Make sure to check your state and local guidelines for guidelines.
Scientists are still learning about the virus. If you are fully vaccinated, you can rest assured knowing that you have significant protection against severe infection. However, until we learn how to mitigate risk for vulnerable populations, we have to continue to take precautionary measures.
This information was reviewed and approved by Infection Preventionist Rosine Angbanzan, MPH (May 2021).
The information on our website is medically reviewed and accurate at the time of publication. Due to the changing nature of the COVID-19 pandemic, information may have since changed. CDC.gov and your state’s health department may offer additional guidance.