Mayo Clinic: Pfizer only 42% effective against the Delta variant

A new study from the Mayo Clinic shows that the Pfizer vaccine is only 42% effective against the Delta variant which has been the most widespread in Minnesota since July.

"If this isn't a wake-up call, I don't know what it is," a senior Biden official told Axios. The study, conducted in collaboration with biomedical software company nFerence, compared the efficacy of Pfizer and Moderna vaccines in the Mayo Clinic Health System from January to July.

During that time, Pfizer's vaccine was 76% effective against infection. But with the release of the Delta variant in July, its effectiveness dropped to 42% as its prevalence increased.

The Moderna vaccine was 86% effective against infection over the January to July study period, but the efficacy of this vaccine also dropped, albeit less drastically, as the prevalence of the delta variant in Minnesota rose. to over 70%. In this case Moderna was 76% effective, however much higher than Pfizer.

Similar studies in other states have confirmed roughly the same figures. These are also consistent with findings from the data analysis in Israel, where efficacy was found to be around 39% for Pfizer, while Moderna was used in minimal quantities. Pfizer and BioNTech have released a statement stating that they "expect to be able to develop and manufacture a bespoke vaccine against that variant in approximately 100 days after a decision to do so, subject to regulatory approval."

The data from the Mayo Clinic confirm what was already suspected: Pfizer does not stop the spread of the Delta variant, or even 100% Modern, even if the effectiveness seems much higher. With an effectiveness of less than 50%, the Green pass loses its significance as a preventive tool.

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The Mayo Clinic article : Pfizer effective only in 42% of cases against the Delta variant comes from .

This is a machine translation of a post published on Scenari Economici at the URL on Thu, 12 Aug 2021 17:03:30 +0000.