Sinovac had announced last week that 94 per cent of people who received three doses of its vaccine developed neutralising antibodies.Nikkei Asia had reported Sinovac stating that its own lab study found that seven out of 20 people who had received two shots had tested positive for neutralising antibodies. So the efficacy rate would be 35 per cent. But the specific levels of neutralising were not revealed.
To date, the evidence indicates a minimal to a modest reduction of vaccine protection against severe disease over the six months after the primary series, the WHO noted. It added that the waning of effectiveness against all clinical disease and infections is more pronounced.
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