Thursday, March 17, 2022

Before age 60, 4th vaccine slightly cuts infection rates, moderately thwarts illness

People who received a fourth shot of Pfizer vaccine were 30 percent less likely to be infected than people who got three doses. Among the Moderna recipients, people were 18% less likely to get infected after a fourth shot.

But Regev-Yochay said that there is a stronger effect against symptomatic illness. Pfizer recipients were 43% less likely to develop symptomatic illness after a fourth shot, and among Moderna participants the figure was 31%.

She emphasized that her research was conducted on health workers under the retirement age, and therefore doesn’t give a picture of the fourth dose’s effectiveness for the elderly, which its main target in Israel and in some other countries, including the UK.

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