For Pfizer / BioNTech, the effectiveness decreases from 88 to 74 percent after six months vaccines AstraZeneca from 77 to 67 percent. “We can’t just watch the protection of people gradually decline as the number of people infected increases again, and the likelihood of further infections increases,” said Tim Spector, study director and epidemiologist.
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Spector fears that in older people who were vaccinated first, the effect of the vaccine could fall below 50 percent by winter. Britain therefore, it wants to start administering third doses of anti-coronavirus products later this year, probably from September.
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