2 doses of Johnson & Johnson's vaccine 85% effective against hospitalizations: South African study The Citizen 4 years ago J&J also found its vaccine likely works as a booster for those who got Pfizer. Source: ABC News 6 Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on LinkedIn (Opens in new window) LinkedIn Print (Opens in new window) Print Pennsylvania woman 1 of 6 who developed rare blood clot linked to J&J vaccineDateApril 14, 2021In relation toRobesoniaJ&J seeks US clearance for COVID-19 vaccine booster dosesDateOctober 5, 2021In relation toSimilar postFDA panel endorses booster shot for J&J COVID-19 vaccineDateOctober 15, 2021In relation toRobesonia
