Health
Explained: Does effectiveness of Pfizer and AstraZeneca jabs against Delta variant reduce over time? – The Indian Express
The results show that the Pfizer vaccine offered a high level of protection — 92% — from developing a high viral load 14 days…

The Pfizer-BioNTech and Oxford-AstraZeneca vaccines offer considerable protection against the Delta variant of Covid-19 but their effectiveness wanes over time, a new study carried out in the UK has found.Researchers at the University of Oxford in the UK…
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