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How effective are the Pfizer, Moderna and AstraZeneca COVID-19 vaccines? – ABC News
Some studies published in recent weeks appear to show some COVID-19 vaccines might be slightly more effective than others, and…

When COVID-19 vaccines were being developed, manufacturers had to hit an efficacy rate of 50 per cent before their jabs could get approval.
Most vaccines now in common use exceeded expectations, with efficacy rates as high as 95 per cent, and all three…
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