80% COVID-19 immunity lost in 6 months in some after Pfizer shot: U.S. study
The Hindu
The study noted that the boosters are even more important as the Delta variant spreads
COVID-19 antibodies produced by the Pfizer vaccine decreased more than 80% in senior nursing home residents and their caregivers six months after receiving their second dose, a U.S. study has found. The research led by Case Western Reserve University and Brown University in the U.S. studied blood samples of 120 nursing home residents and 92 health care workers. The researchers particularly looked at humoral immunity — also called antibody-mediated immunity — to measure the body's defences against the SARS-CoV-2 virus, which causes COVID-19. The yet-to-be published study, posted on the preprint server medRxiv, found that individuals' antibody levels decreased more than 80% after six months. The results were the same in seniors, with a median age of 76, and caregivers, with a median age of 48, and old alike, according to the researchers.
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