Vaccine Less Effective Against New COVID Variant
A study conducted in Israel found that the Pfizer COVID-19 vaccine is somewhat less effective against the more infectious delta variant, though it was still found to be effective at preventing severe illness.
As The Wall Street Journal reports, the Pfizer vaccine protected 64 percent of immunized people during an outbreak of the delta variant, a sharp drop when compared to the 94 percent of people it had previously been shown to protect. However, the shot was still 94 percent effective at preventing severe illness, a slight decrease from the 97 percent that were kept from experiencing severe illness previously.
The data for the study was collected from June 6 through early July, according to officials from Israel’s Health Ministry. The data and the methodology of the study was not released, according to the Journal.
Some health experts expressed skepticism about the Israel study, saying mRNA vaccines like Pfizer have been shown to offer strong protection against COVID-19 infection.
To be clear, not saying 64% is definitely wrong
But UK data says close to 90% against infections, >90% against severe illness
So we'll see occasional data points that don't fit
May turn out to be right
But right now, bulk of evidence says vaccines work very well against Delta
— Ashish K. Jha, MD, MPH (@ashishkjha) July 5, 2021
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