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Israeli, UK data offer mixed signals on vaccine’s potency against Delta strain

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22.07.2021

New data from Israel and the United Kingdom painted a confusing and contradictory picture on Thursday as to the effectiveness of Pfizer’s COVID-19 vaccine in fighting off the Delta variant of the coronavirus.

New Health Ministry statistics indicated that, on average, the Pfizer shot — the vaccine given to nearly all Israelis — is now just 39% effective against infection, while being only 41% effective in preventing symptomatic COVID. Previously, the Pfizer-BioNTech vaccine was well over 90% effective against infection.

Meanwhile, a new UK study published this week in The New England Journal of Medicine found the same vaccine to be 88% effective in preventing symptomatic COVID — more than twice the rate found in the Israeli data.

Israel’s research agreed, at least, that the shot was highly effective in avoiding serious illness, at 91.4% effectiveness.

Some analysts have warned that the figures on vaccine effectiveness are prone to major inaccuracies because of a range of factors, including questions over whether there is accurate........

© The Times of Israel


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