I am immunocompromised. Do I need an additional shot?

A small percentage of community members need an additional dose of their primary series in order to reach full immunity.

  • People with moderately to severely compromised immune systems are especially vulnerable to COVID-19, and may not build the same level of immunity to 2-dose vaccine series compared to people who are not immunocompromised.
  • CDC recommends that people with moderately to severely compromised immune systems receive an additional dose of mRNA COVID-19 vaccine at least 28 days after a second dose of Pfizer-BioNTech COVID-19 vaccineor Moderna COVID-19 Vaccine.
  • This additional dose is intended to improve immunocompromised people’s response to their initial vaccine series
  • An additional dose is different from a booster shot. READ MORE about the difference between the two. 





  1. NEW: People who initiated vaccination with Johnson & Johnson’s Janssen COVID-19 vaccine should receive a total of 3 doses: 1 Johnson & Johnson’s Janssen dose, followed by 1 additional mRNA dose at least 28 days later, then 1 booster dose at least 2 months after the 2nd (additional) dose. mRNA vaccines are preferred for the booster.
  2. NEW: People who received a 3-dose mRNA COVID-19 vaccination series should receive the booster dose 3 months after the primary series (instead of 5 months after the primary series).
  3. CLARIFY: CDC clarified existing guidance to confirm that those who previously received mRNA COVID-19 vaccines (Pfizer-BioNTech or Moderna) should receive a total of 4 doses: a primary series of 3 doses of an mRNA vaccine, plus 1 booster dose of an mRNA vaccine (4th dose).

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1. What COVID-19 Vaccines are Available?
2. What ages are eligible to be vaccinated?
3. How do we know COVID-19 vaccines are safe for kids?
4. If the vaccine works for other people, why do kids need it?
5. I have already had COVID-19. Do I still need to get vaccinated?
6. Who should get a COVID-19 booster shot?
7. I am immunocompromised. Do I need an additional shot?
8. How do the COVID-19 vaccines work?
9. Will the vaccines cause side effects?
10. How were the COVID-19 vaccines produced so quickly?
11. Can I get COVID-19 from these vaccines?
12. Can receiving a COVID-19 vaccine cause you to be magnetic?
13. Do COVID-19 vaccines contain microchips?
14. Can the COVID-19 vaccine alter my DNA?
15. Is it safe for me to get the COVID-19 vaccine if I would like to have a baby one day?
16. Will getting a COVID-19 vaccine cause me to test positive for COVID-19 on a viral test?
17. What can you do once you are fully vaccinated?
18. I missed my 2nd shot of the mRNA vaccine. What should I do?
19. I lost my vaccine card. How can I get a new one?
20. How do I host a COVID-19 vaccine event?
21. What is the difference between quarantine and isolation?
22. If I test positive for COVID-19, what should I do?
23. If I was exposed to someone with COVID-19, what should I do?
24. When can I leave isolation if I had COVID-19 symptoms?
25. One or more health conditions increase the risk of getting very sick with COVID-19. What are those conditions?