A booster shot of Johnson & Johnson’s Covid-19 vaccine produced a strong and rapid antibody response against the virus, the pharmaceutical company said on Wednesday.
The preliminary data from the world’s largest healthcare company comes as top US public health officials and rival vaccine makers say a booster shot programme is needed to protect against waning immunity.
J&J said a second shot elicited a nine-fold increase in antibodies against Covid compared with levels seen 28 days after a single dose of the jab.
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