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VACCINE DEVELOPMENTS

A study published in the New England Journal of Medicine has found that two doses of the Pfizer vaccine is 88% effective in preventing symptomatic disease from the Delta variant of the coronavirus compared with 93.7% against the Alpha variant, broadly the same as previously reported. Meanwhile, two shots of the AstraZeneca vaccine is 67% effective against the Delta variant, up from 60% originally reported, and 74.5% effective against the Alpha variant, compared with the original estimate of 66% effectiveness.

An interval of eight to 10 weeks between doses of the Covid-19 vaccine developed by Pfizer Inc and BioNTech SE boosts the effectiveness of the two-shot regimen compared with a shorter interval, a study from the University of Oxford has found.

Sinopharm’s Covid-19 vaccine elicited weaker antibody responses against the Delta variant,

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