Studies confirm waning immunity from Pfizer's Covid-19 vaccine but protection remains strong

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Thu, 2021-10-07 10:15 — mike kraft

Studies confirm waning immunity from Pfizer's Covid-19 vaccine Two real-world studies published Wednesday 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. Maggie Fox, CNN CNN

(CNN) Two real-world studies published Wednesday 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. ...

The researchers noted that levels of so-called neutralizing antibodies -- the immune system's first line of defense against infection -- correlate with protection against infection, but for this study they studied only antibody levels.

"Published work about many vaccines, such as those against measles, mumps, and rubella, has shown a small decrease each year of 5 to 10% in the neutralizing antibody levels," they wrote. "We found that a significant and rapid decrease in humoral response to the BNT162b2 vaccine was observed within months after vaccination." ...

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