A real-life study from South Africa said that the J&J vaccine was 85% effective against hospitalization, even after the omicron variant appeared.“When a booster shot was administered six to nine months after a primary single dose, vaccine effectiveness increased over time from 63 percent at 0-13 days, to 84 percent at 14-27 days and 85 percent at 1-2 months post-boost,” J&J said in a statement.reported.
In cases where the J&J shot was used as a booster in patients who first had Pfizer/BioNTech’s vaccine, they had a 41-fold increase in antibodies and a five-fold increase in T-cells,The Pfizer and J&J results were compared to results in people who got only Pfizer as the three-shot series,After four weeks, the Pfizer and J&J regimen resulted in a 17-fold increase in antibodies and a 1.4-fold increase in T-cells.