As outbreaks driven by the Delta variant take hold across the globe, a number of countries are changing their approach to vaccinations in a bid to improve effectiveness.
The World Health Organization requires vaccines to have a minimum efficacy rate of 50 per cent.As new strains emerge, Professor Jin believes the effectiveness of all our current vaccines will decline, because they are built on the ancestral strain of the virus.
But many manufacturers already have variant-specific vaccines in clinical trials for booster shots down the track."Effectiveness of 50 or 60 per cent can still save millions of lives," she said. As outbreaks driven by the Delta variant take hold across the globe, a number of countries are changing their approach.Alarm is growing in Chile over the Delta strain.
With nearly 50 per cent of people vaccinated, the country still went into a two-week lockdown due to a spike in Delta case numbers.Last week, the leaders of a Chilean late-stage human trial of Sinovac's CoronaVac vaccine recommended a third dose of the jab to protect against the more contagious Delta variant.While Sinovac is known to be less effective than Pfizer, the effectiveness of the Pfizer vaccine against the Delta strain is also under the spotlight in Israel.
Malaysia's future inoculation drive will be largely anchored by the Pfizer vaccine, a health official said.In Thailand, people who have received one dose of the Sinovac vaccine will now get AstraZeneca as their second dose., and now many countries are using that strategy, with evidence that it works well."[For] those countries who have no other way, they are still better than nothing. That's the reality," he said.
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