The Health Ministry is studying whether Sinovac vaccine recipients who had been jabbed with a Pfizer booster would need a fourth dose to increase their protection against the highly infectious Covid-19 Omicron variant.
Health Minister Khairy Jamaluddin said the ministry had taken note of a recent study which found that Sinovac’s two-dose Covid-19 vaccine followed by a booster Pfizer shot was less effective in curbing the spread of the Omicron variant.
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