COVID-19 Vaccine Booster Doses and Third Doses


This page has been automatically translated from English. MSDH has not reviewed this translation and is not responsible for any inaccuracies.

Additional COVID-19 vaccine doses can improve protection against COVID-19 for older adults, those with certain medical conditions, and other groups at higher risk.

Booster Vaccinations

A single booster dose is recommended for certain groups, based on the type of COVID-19 vaccine they have already received.

Pfizer and Moderna

For those who have already received both doses of Pfizer or Moderna vaccine at least six months ago, the following groups are eligible for a booster dose.

  • Adults aged 65 years and older
  • Long-term care facility residents
  • Adults aged 18 and older with certain underlying medical conditions (see below)
  • Adults aged 18 and older in high risk settings that increase their risk of exposure:
    • First responders (healthcare workers, firefighters, police, congregate care staff)
    • Education staff (teachers, support staff, daycare workers)
    • Food and agriculture workers
    • Manufacturing workers
    • Corrections workers
    • U.S. Postal Service workers
    • Public transit workers
    • Grocery store workers

Johnson & Johnson

Anyone 18 and older who was vaccinated with Johnson & Johnson (Janssen) vaccine at least two months ago is eligible for a booster.

Mixing vaccine types: Eligible individuals may receive a booster dose of any of type of COVID-19 vaccine currently available: Moderna, Pfizer or Johnson & Johnson.

Getting a Booster Dose

  • Check with your doctor, a pharmacy, or other vaccination provider about getting a COVID-19 booster dose. Find a vaccination provider »
  • Booster doses are also available at county health departments. Use the online scheduler below, or call the Mississippi COVID-19 Hotline at 877-978-6453 for assistance.

Schedule a booster dose

Underlying Medical Conditions

Underlying medical conditions qualifying for a booster dose:

  • Chronic kidney disease
  • Chronic lung diseases (COPD, asthma, etc.)
  • Dementia or other neurological conditions
  • Diabetes (type 1 or 2)
  • Down syndrome
  • Heart conditions (such as heart failure, coronary artery disease, or cardiomyopathies)
  • Hypertension
  • Liver disease
  • Overweight, obesity or severe obesity (body mass index (BMI) over 25 kg/m2)
  • Pregnancy
  • Sickle cell disease or thalassemia
  • Smoking (current or former)
  • Stroke
  • Substance abuse disorders
  • Other medical conditions determined by a medical provider

Third Vaccine Doses

A third dose of COVID-19 vaccine can provide added protection if you have a medical condition that affects your immune system and you are at high risk for developing more serious illness from COVID-19.

Third vaccine doses are available only for those who received Moderna or Pfizer vaccine, and whose last shot was at least 4 weeks ago.

Qualifying Conditions

You qualify for a third dose of Moderna or Pfizer vaccine if you:

  • Have been receiving active cancer treatment for tumors or cancers of the blood
  • Received an organ transplant and are taking medicine to suppress the immune system
  • Received a stem cell transplant within the last 2 years or are taking medicine to suppress the immune system
  • Have moderate or severe primary immunodeficiency (such as DiGeorge syndrome, Wiskott-Aldrich syndrome)
  • Have advanced or untreated HIV infection
  • Are receiving active treatment with high-dose steroids or other drugs that may suppress your immune response
  • Have any other medical condition that your provider says will limit your immune response

Getting a Third Dose

You can schedule an additional vaccination dose at a county health department or through your doctor or regular health care provider.

  • Schedule a third dose appointment at a county health department
    You'll be asked questions about qualifying for additional vaccination and be able to select a county health department for an appointment.

Schedule a third dose appointment

  • Consult your doctor or a health care provider. They can evaluate your health status and determine whether you need an additional vaccination dose. If you do, they will provide the vaccination.
Last reviewed on Sep 29, 2021
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Mississippi State Department of Health 570 East Woodrow Wilson Dr Jackson, MS 39216 866-HLTHY4U Contact and information

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