CAPE TOWN, Dec 30 ― A booster dose of Johnson & Johnson Inc's single-dose Covid-19 vaccine was 84 per cent effective at preventing hospitalisation in South African healthcare workers who became infected as the Omicron variant spread, researchers said today.
An initial course of inoculation has been shown to offer greatly reduced protection against Omicron, particularly against infection. However, several studies have suggested that a booster dose still provides significant protection against severe illness. Earlier this month, another South African-based study showed that a first round of inoculation with two doses of Pfizer-BioNTech's Covid-19 vaccine had been less effective in South Africa at keeping people infected with the virus out of hospital since the Omicron variant emerged last month.
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