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One difference between the Pfizer and Moderna vaccines is the wait time between the two required doses: Pfizer's are given 21 days apart, while the Moderna shots are given 28 days apart. After that protein piece emerges on the surface of a cell, the human immune system recognizes it and begins making antibodies for it - which offer protection if the person is exposed to the actual virus in the future.
REVEREND AND THE MAKERS THE STATE OF THINGS RARELY SEEN HOW TO
But mRNA vaccines do something different: They teach human body cells how to make a harmless piece of a protein - a "spike protein" - that's also found on the surface of the coronavirus. Traditionally, vaccines have been made from a weakened or inactivated germ that trains the immune system to fight off infection if it encounters the virus in the future. The Pfizer and Moderna vaccines are both made using messenger RNA, or mRNA, technology.
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On August 23, Pfizer's vaccine became the first to be granted full FDA approval. A third vaccine, from Johnson & Johnson's Janssen Biotech division, got FDA authorization in late February and only requires one shot.Īll three proved highly effective at preventing severe illness, hospitalizations and deaths from COVID-19.
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In December 2020, the FDA authorized emergency use of the first two coronavirus vaccines in the U.S., one made by Pfizer and BioNTech, and the other by Moderna. What are the differences between the COVID vaccines? The Moderna and Johnson & Johnson vaccines are currently authorized only for ages 18 and up. What parents should know about Pfizer shot fo.