'We have to be mindful that, with time, the effectiveness of these vaccines may wane.'
- Dr. Isaac Bogoch
'The delta variant, already in more than 104 countries, is concerning health officials in the U.S. as they see more breakthrough infections, which occur in fully vaccinated people, even though they are more mild.''Pfizer and BioNTech’s Covid-19 vaccine is just 39% effective in Israel where the delta variant is the dominant strain, but still provides strong protection against severe illness and hospitalization, according to a new report from the country’s Health Ministry.
The efficacy figure, which is based on an unspecified number of people between June 20 and July 17, is down from an earlier estimate of 64% two weeks ago and conflicts with data out of the U.K. that found the shot was 88% effective against symptomatic disease caused by the variant.
However, the two-dose vaccine still works very well in preventing people from getting seriously sick, demonstrating 88% effectiveness against hospitalization and 91% effectiveness against severe illness, according to the Israeli data published Thursday.
“We have to be mindful that, with time, the effectiveness of these vaccines may wane,” said Dr. Isaac Bogoch, an infectious disease professor at the University of Toronto.
He stressed that the shots are still highly effective in preventing severe infection, helping hospital systems not get too overwhelmed heading into the colder months. That being said, “we’re still in the Covid era and anything can happen,” he said.
“We have to be prepared and we have to be nimble that people may need a booster at some point,” he added. “This close surveillance that’s happening in countries like Israel, the U.K. and other parts of the world is going to be very helpful in driving policy if and when we do need boosters.”
The delta variant, already in more than 104 countries, is concerning health officials in the U.S. as they see more breakthrough infections, which occur in fully vaccinated people, even though they are more mild.'
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Israel says Pfizer Covid vaccine is just 39% effective as delta spreads, but still prevents severe illness, July 23, 2021
Context(SARS-CoV-2 (COVID-19)) - '..emerging evidence delta and at least one other variant may be adept at evading vaccine-induced antibodies..'