Delta Troubles? Retrospective Study Led by nference & Mayo Clinic Reveals Pfizer COVID-19 Shot Only 42% Effective During July

Delta Troubles? Retrospective Study Led by nference & Mayo Clinic Reveals Pfizer COVID-19 Shot Only 42% Effective During July

A brand-new study indicates some possibly troubling news concerning COVID-19. Based on a study in preprint, a poor performance from Pfizer’s mRNA vaccine has appeared in the July data and could indicate Delta-driven trouble ahead. In sum, the July data produced by this Mayo Clinic and nference retrospective study suggests that Pfizer’s vaccine product known as BNT162b2 was only 42% effective against infection, which has led to some sources for White House officials to sit up and take notice. The study looked at the effectiveness of the Pfizer and Moderna vaccines inside the Mayo Clinic Health System during the January to July period. Moderna’s vaccine was 86% effective against infection for the entire study period, and Pfizer’s was 76%. Yet in July, Moderna was 76% effective, and Pfizer declined to a troubling 42%. These findings were based on Minnesota data, and at least some suggest Delta was dominant at the time. Experts don’t know if this means that the vaccines are less effective over time, less effective against Delta, or perhaps another reason. Venky Soundararajan, a lead author of the study, notes that “Based on the data that we have so far, it is a com...

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