JOHANNESBURG – A preliminary South African government study published Thursday showed a booster of the Johnson & Johnson Covid vaccine was 85 percent effective in preventing hospitalization from the Omicron variant, a finding that helps revive the shot’s reputation. The South African Medical Research Council compared 69,000 health care workers who received two doses of the vaccine, based on viral vector technology, against a group of people who were unvaccinated. The research, which has not yet been peer reviewed, was conducted from November 15 to December 20, a time when the heavily-mutated O…

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