By Tim Cocks JOHANNESBURG (Reuters) -A Johnson and Johnson COVID-19 vaccine booster shot is 85% effective in protecting against being hospitalised by 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 Gray 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. “We saw an 85% vaccine effectiveness and we saw that this kind of vaccine effectiveness is maintained for up to two months,” she said. “We are very ha…

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