

COVID-19 (coronavirus 2019) vaccine, Janssen - Johnson & Johnson

Pronunciation: KOE vid (koe ROE na vye rus) VAX een

Brand: Janssen COVID-19 Vaccine PF


A very small number of people had blood clots after receiving this vaccine, but the risk of this side effect is remote. Becoming infected with COVID-19 is much more dangerous to your health than receiving this vaccine.

What is the COVID-19 vaccine?

COVID-19 is a serious disease caused by a coronavirus called SARS-CoV-2 (Serious Acute Respiratory Syndrome Coronavirus 2). COVID-19 is spread from person to person through the air.

COVID-19 can affect your lungs or other organs. Symptoms may be mild or serious and include fever, chills, cough, sore throat, shortness of breath, tiredness, body aches, headache, loss of taste or smell, runny or stuffy nose, nausea, vomiting, or diarrhea.

The COVID-19 vaccine is used to help prevent severe disease and death from COVID-19 caused by SARS-CoV-2.

The US Food and Drug Administration (FDA) has authorized emergency use of the Johnson & Johnson vaccine only in adults.

COVID-19 vaccine does not contain coronavirus and cannot give you COVID-19. This vaccine will not treat an active COVID-19 infection.

Like any vaccine, COVID-19 vaccine may not provide protection in every person.


Tell your vaccination provider if you've ever had an allergic reaction to a COVID-19 vaccine, or if you are allergic to polysorbate-80.

If you are infected with COVID-19, are waiting for testing results, or are exposed to someone infected with COVID-19: You may not be able to receive this vaccine until you have no symptoms and/or your required quarantine period has ended. Receiving this vaccine will not make you less contagious to other people if you are infected with COVID-19 but you have no symptoms.

If you had COVID-19 and were treated with monoclonal antibodies or convalescent plasma: You should wait 90 days before getting a COVID-19 vaccine. Ask your doctor if you are unsure about any COVID-19 treatments you received.

Tell your vaccination provider if:

  • you have a fever;
  • you have any allergies;
  • you have bleeding problems, or if you use a blood thinner (warfarin, Coumadin, Jantoven);
  • you have a weak immune system caused by disease or by using certain medicine;
  • you are pregnant or breastfeeding;
  • you've received any other COVID-19 vaccine; or
  • you have fainted after receiving an injection.

COVID-19 is more likely to cause serious illness or death in a pregnant woman. Not all risks are known yet, but this vaccine is likely to be less harmful than becoming infected with COVID-19 during pregnancy.

If you are pregnant, your name may be listed on a pregnancy registry to track the effects of this vaccine on the baby.

How is this vaccine given?

Read all vaccine information sheets provided to you.

COVID-19 vaccine is given as an injection (shot) into a muscle. The Janssen vaccine is given as a single dose. You should not receive this vaccine as a second shot for another type of COVID-19 vaccine (such as the Moderna or Pfizer types).

You will receive a vaccination card showing the date and type of COVID-19 vaccine you received.

You will be "fully vaccinated" if it has been at least 2 weeks since you received this vaccine. You may become infected with COVID-19 if the vaccine has not had enough time to provide protection.

Even after you are fully vaccinated, keep using infection control methods when you are in public or around others who may not have been vaccinated. This includes social distancing, hand-washing, using protective face covering, disinfecting surfaces you touch a lot, and not sharing personal items with others.

Receiving a COVID-19 vaccine will not cause you to test positive on a coronavirus test. However, once your body develops immunity to COVID-19, you could test positive on an antibody test (a test to detect immunity in your body from previous exposure to coronavirus).

It is not known how long this vaccine will protect you from infection with COVID-19. It also is not known how long immunity will last in a person who's been infected with and recovered from COVID-19. COVID-19 vaccine is still being studied and all of its risks are not yet known. Updated federal public health recommendations may be found at https://www.cdc.gov/coronavirus/2019-ncov/vaccines/fully-vaccinated-guidance.html

What happens if I miss a dose?

The Janssen COVID-19 vaccine is used as a single dose and does not have a booster schedule.

What happens if I overdose?

An overdose of this vaccine is unlikely to occur.

What should I avoid after receiving this vaccine?

Avoid receiving other vaccines without first seeking medical advice.

What are the possible side effects of this vaccine?

Get emergency medical help if you have signs of an allergic reaction: hives; dizziness, weakness, fast heartbeats; difficult breathing; swelling of your face, lips, tongue, or throat.

An allergic reaction is more likely to occur within a few minutes to 1 hour after you receive the vaccine. You will be treated quickly if you have a reaction.


A very small number of people had blood clots 1 to 2 weeks after receiving this vaccine, but the risk of this side effect is remote. Seek medical attention right away if you have:

  • bruising or tiny red spots under your skin;
  • severe headaches or blurred vision;
  • chest pain, shortness of breath; or
  • stomach pain, leg pain or swelling.

Some people receiving this vaccine had nervous system problems within 42 days after receiving this vaccine, but the risk of this side effect is very low. Seek medical attention right away if you have:

  • weakness or tingling;
  • trouble speaking or swallowing;
  • problems with balance or eye movement; or
  • loss of bladder or bowel control.


Not all possible side effects are known. Common side effects may include:

  • fever;
  • pain, redness, or swelling where the shot was given;
  • nausea;
  • headache, muscle pain; or
  • feeling tired.

Other side effects, mild or serious, may occur with more widespread use of COVID-19 vaccine.


You may also use a smartphone-based program called V-safe to communicate with the Centers for Disease Control and Prevention (CDC) about any health problems you have after receiving a COVID-19 vaccine: www.cdc.gov/vsafe.

What other drugs will affect this vaccine?

Before receiving this vaccine, tell your vaccination provider about all other vaccines you have received and all medicines you use. This includes prescription and over-the-counter medicines, vitamins, and herbal products.

Where can I get more information?




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