1.Which vaccine is being given and what are its details?
Manufacturer: Janssen Pharmaceuticals Companies of Johnson & Johnson.Type of vaccine: Viral vector
Number of shots: 1 shot
How given: Shot in the muscle of the upper arm
Does not contain:
2. Who should get vaccinated
3. Who should not get vaccinated
4. What are the possible side effects?
Most common side effects
In the arm where you got the shot:
Throughout the rest of your body:
- Muscle pain
These side effects usually start within a day or two of getting the vaccine. Side effects might affect your ability to do daily activities, but they should go away in a few days.
Summary of safety data
- In clinical trials, side effects were common within 7 days of getting vaccinated but were mostly mild to moderate.
- Side effects were more common in people 18–59 years old compared to people 60 years and older.
- CDC will continue to provide updates as we learn more about the safety of the J&J/Janssen vaccine in real-world conditions.
5. How does this vaccine work?
- The J&J/Janssen vaccine was 66.3% effective in clinical trials(efficacy) at preventing laboratory-confirmed COVID-19 illness in people who had no evidence of prior infection 2 weeks after receiving the vaccine. People had the most protection 2 weeks after getting vaccinated.
- The vaccine had high efficacy at preventing hospitalization and death in people who did get sick. No one who got COVID-19 at least 4 weeks after receiving the J&J/Janssen vaccine had to be hospitalized.
- Early evidence suggests that the J&J/Janssen vaccine might provide protection against asymptomatic infection, which is when a person is infected by the virus that causes COVID-19 but does not get sick.
- CDC will continue to provide updates as we learn more about how well the J&J/Janssen vaccine works in real-world conditions.