The Pfizer Vaccine has become less effective in preventing infection of Covid-19 in recent weeks, although it remains a robust bulwark against serious illness as governments around the world scramble to respond to the rampant spread of a new Delta variant of the coronavirus.
The findings, which are preliminary and based on a small sample, suggest that after two shots the vaccine was 39% effective at reducing the risk of infection and 40% effective at reducing the risk of symptomatic disease during a period when the Delta variant dominated cases in Israel, according to the country’s Health Ministry.
“It’s important to say that in terms of protecting against severe illness, hospitalization and death, the Pfizer vaccine is still very very efficient,” said Nadav Davidovitch, a member of the expert advisory panel to the Israeli government on the coronavirus.
Published in the New England Journal of Medicine and sponsored by Public Health England, the study involved nearly 20,000 people and said the vaccine was 88% effective at protecting against symptomatic disease.
Before the Delta outbreak, Israel’s Health Ministry said Pfizer was 94% effective at preventing infection and ensured 97% of people inoculated avoided severe illness.
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