According to a new U.S. study, the Pfizer-BioNTech vaccine against coronavirus is 90% effective in preventing hospitalizations for up to six month. There are no signs of waning, according to Kaiser Permanente and Kaiser Research.
Scientists found that the vaccine is also effective against the highly contagious Delta variant. The vaccine proved to be 93 percent effective in preventing hospitalizations from Delta variants, as compared to 95 percent for those who had their virus samples sequenced.
According to Sara Tartof (an epidemiologist at Kaiser Permanente Southern California, and the first author of this study), protection against hospitalization is high even when Delta dominates.
The effectiveness of the vaccine against infection declined over time. It fell from 88 percent in the first month to 47 percent after five.
