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Covid vax protection wane over time, boosters important: Pfizer, Moderna
3rd Covid wave to be less severe, says BHU scientist
Global Covid-19 caseload tops 224.6 mn
Can't scrap existing policy: SC on plea seeking door-to-door Covid vaccination
Explained: What are ‘T cells’ that can offer long-lasting Covid protection
Pfizer says its vaccine is highly effective on Indian variant
Delhi HC slams ‘irritating’ vaccine caller tune