AstraZeneca-Oxfordâs Covid-19 vaccine demonstrated an efficacy of 79% at preventing symptomatic Covid-19 in large-scale phase III trials in the US, much higher than UK trial results. Interim data rests speculation on the vaccineâs efficacy on those over 65 years, and showed a 100% efficacy against severe disease & hospitalisation. The data validates it âas a much-needed additional vaccination option, offering confidence that adults of all ages can benefit from protection against the virusâ, AstraZeneca said. Confidence in the safety of AstraZenecaâs Covid-19 vaccine has taken a big hit in several countries in Europe as reports of rare blood clots have been linked to it, with many countries temporarily pausing on its use in the vaccinations. In India, government is monitoring the serious adverse effects of the vaccines being administered, including Covishield, AstraZenecaâs vaccine manufactured by Serum Institute. Meanwhile, India on March 22 said that the gap between the first and second doses of the AstraZeneca-Oxford University's Covishield vaccine should be increased to 6-8 weeks from the current 28 days.
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