Which Covid Vaccine Should You Get? Experts Weigh the Effect Against Severe Disease January 29, 2021 Auto Bot AstraZeneca PLC, Clinical Trials, Coronavirus (2019-nCoV), Johnson & Johnson, Moderna Inc, Novavax Inc, Pfizer Inc, Vaccination and Immunization, your-feed-healthcare 0 Infectious disease doctors say getting a shot of the J&J vaccine, which has a lower efficacy against the virus than other vaccines, would still be well worthwhile.