JOHANNESBURG (Reuters) – A booster shot of the Johnson and Johnson COVID-19 vaccine has shown 85% effectiveness in protecting against the Omicron variant for 1-2 months after it is received, the head of South Africa’s Medical Research Council (SAMRC) said on Friday. Glenda Grey presented the findings of a SAMRC study at a South African health ministry briefing on the COVID-19 fourth wave, which has been driven by the new variant. (Reporting by Tim Cocks; editing by Jason Neely)

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