Vaccine effectiveness against COVID-19 infection dropped from about 91% to 66% once the Delta variant became the dominant strain in the U.S., a new CDC study finds.
Johnson & Johnson will submit the data to the FDA, which is evaluating similar studies from Pfizer and Moderna. The FDA could authorize booster shots for Americans in September, which could be available to people 8 months after their last vaccination, accordingThe Johnson & Johnson researchers also found that the booster shot increased the supply of immune cells in the body, which can attack the cells infected with the coronavirus.
As studies continue, vaccine companies are still working to find out how long the increased antibody levels last after a booster shot. “We don’t have long-term human studies, but my prediction would be that those responses should be maintained after the boost,” Lynda Coughlan, PhD, a virologist at the University of Maryland School of Medicine, who isn’t involved with these studies, toldCDC: “Effectiveness of COVID-19 Vaccines in Preventing SARS-CoV-2 Infection Among Frontline Workers Before and During B.1.617.2 Variant Predominance -- Eight U.S. Locations, December 2020-August 2021.
CNN: “Vaccines are less protective against Delta infection but still reduce risk by two-thirds, CDC study shows.” Johnson & Johnson: “Johnson & Johnson Announces Data to Support Boosting its Single-Shot COVID-19 Vaccine.”© 2021 WebMD, LLC. All rights reserved.
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