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Pfizer and Moderna Are Studying Possible COVID Booster Shots—Why a Third Dose May Be Needed

Pfizer and Moderna Are Studying Possible COVID ‘Booster’ Shots Why a Third Dose May Be Needed Health.com 2/25/2021 © Provided by Health.com Adobe Stock The two COVID-19 vaccines currently in use in the US may be up to 95% effective in preventing infection after two doses, but the pharmaceutical companies behind them aren t stopping there. Pfizer and Moderna both announced this week that a third booster dose is being studied. A statement from Pfizer confirmed that studies involve participants in two age groups (18 to 55 and 65 to 85). Per NBC News, all were volunteers in Pfizer s initial phase 1-2 clinical trial, which began in May 2020. Each participant will be given the booster shot, which will be exactly the same as what they were given last year when they received two doses of the vaccine three weeks apart.

Why Are the New Strains of COVID-19 More Contagious? Here s What We Know So Far

Why Are the New Strains of COVID-19 More Contagious? Here s What We Know So Far Health.com 1/8/2021 Claire Gillespie Replay Video UP NEXT Just when things were starting to look up on the pandemic front, with a rollout of vaccines underway across the US and in several other countries, the latest news about COVID-19 has reminded us that we ve still got a long way to go. A more infectious strain of the virus, identified first in the UK and known as B.1.1.7, has been confirmed in at least 33 countries and five states (California, Colorado, Florida, New York, and Georgia). Anthony Fauci, MD, director of the National Institute of Allergy and Infectious Diseases, said it s likely that the B.1.1.7 strain has already spread to other states. I think it s pretty clear that if it s in places like California, and New York and Colorado… that pretty soon it s going to be in several more states, Dr. Fauci told

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