RIO DE JANEIRO, BRAZIL - The Pfizer/BioNtech vaccine is more effective in fighting Delta coronavirus cases than Oxford/AstraZeneca's, but its efficacy fades faster, a British study says.
The study established that for high viral load infections, a Pfizer second-dose recipient was 90% more protected against the Delta variant one month before than an unvaccinated individual. The percentage drops to 85% two months later, and 78% three months later.
In parallel, people administered two AstraZeneca doses are 67% protected one month later, 65% two months later, and 61% three months later.
After four or five months the protection . . .
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