The effectiveness of Pfizer’s COVID-19 vaccine in preventing symptomatic infection drops over 10 percent after six months, the company said Wednesday. The shot, developed in conjunction with Germany’s BioNTech, was 96 percent effective for the two months following the second dose, according to a study from the companies’ scientists. However, the efficacy drops in the following months, declining to 83.7 percent after four to six months. CEO Albert Bourla said on CNBC that a drop in efficacy after such a short time is “not uncommon.” Effectiveness in preventing severe disease remained around 97 percent up to six months, the end time of the published data, which come from an ongoing study of 42,000 volunteers across six countries who each received two jabs three weeks apart. The new results, which are through March 13, follow other indications that protection from the Pfizer jab decreases over time. The study is preprint, meaning …
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