Two doses of Pfizer-BioNTech’s Covid-19 vaccine appear to have given 70 per cent protection against hospitalisation in South Africa in recent weeks, a major real-world study on the potential impact of Omicron showed on Tuesday, as the country battles a spike in infections linked to the new variant.The study released by South Africa’s largest private health insurance administrator, Discovery Health, was based on more than 211,000 positive Covid-19 test results from November 15 to December 7,…

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