Two real-world studies confirm that the immune protection offered by two doses of Pfizer's Covid-19 vaccine drops off after two months or so, although protection against severe disease, hospitalization and death remains strong.
The studies, from Israel and from Qatar and published in the New England Journal of Medicine, support arguments that even fully vaccinated people need to maintain precautions against infection.One study from Israel covered 4,800 health care workers and showed antibody levels wane rapidly after two doses of vaccine"especially among men, among persons 65 years of age or older, and among persons with immunosuppression.
Israel has been boosting its entire population and now says it will require people to have had a third shot to be considered fully vaccinated.In the United States, more than 6 million people have received a third dose of vaccine and average the pace of booster shots is higher than the rate of people getting vaccinated for the first time, according to CDC data.
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