Johnson & Johnson’s Janssen

Johnson & Johnson’s Janssen COVID-19 Vaccine Overview and Safety

General Information

• Name: JNJ-78436735
• 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: Eggs, preservatives, latex

How Well the Vaccine Works

• 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.