mellowyellow
Well-known Member
A full course of the Pfizer-BioNTech vaccine was just 39% effective at preventing infections and 41% effective at preventing symptomatic infections caused by the Delta Covid-19 variant, according to Israel’s health ministry, down from early estimates of 64% two weeks ago.
The figures, based on data from an unspecified number of people between June 20 and July 17, are significantly lower than previous estimates of the vaccine’s efficacy against other variants, which initial clinical trials found to be 95%.
……………. However, the Israel health ministry has not revealed the data behind their results and there are a number of issues in the way the study appears to have been conducted that could create uncertainty. The study did not, for example, take the steps needed to rule out alternative explanations for the lower efficacy, such as bias in who is tested for Covid-19……………..
https://www.forbes.com/sites/robert...llness-israel-study-suggests/?sh=79057a9f584f