Duke study: Moderna vaccine less effective against Omicron variant, but booster helpsRALEIGH, N.C. — The standard two doses of the Moderna vaccine appear to be far less effective against the new Omicron variant of the coronavirus, but a booster shot seems to make up the difference. That’s the result of a study conducted by researchers at Duke University and the National Institutes of Health and released Thursday. The results mirror those of a similar study involving the Pfizer vaccine released earlier this week. The Duke and NIH study used blood samples of people who received the Moderna vacci…

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