White House COVID-19 advisor Anthony Fauci downplayed on Aug. 15 a recent study from a prominent medical research center that deemed the Pfizer vaccine less effective than the Moderna vaccine. The Mayo Clinic and Cambridge-based biotech company nference, in a study, found that both mRNA COVID-19 vaccines’ effectiveness dropped in the month of July. The researchers, while saying the vaccines provided good protection against the virus, found that Moderna’s vaccine effectiveness was 76 percent, as compared with Pfizer’s 42 percent. “That study … is a pre-print study, it hasn’t been fully peer-reviewed,” Fauci said on CBS’s “Face the Nation” of the recent Mayo-nference study’s findings, which was published on the website medRxiv.org. The study gathered data from about 25,000 Minnesota residents from January and July. “I don’t doubt what they’re seeing, but there are a lot of confounding variables in there, about when one was started, the relative amount of …