![]() ![]() Adenoviruses, in general, cause a cold or flu-like illness. An adenovirus acts as a delivery vehicle, carrying the spike protein from the coronavirus. ![]() The Johnson & Johnson (Janssen) vaccine uses an adenovirus rather than mRNA. Once your body knows how to make the protein, it can recognize COVID-19 and fight it. The mRNA tells your cells how to make a protein from the coronavirus. The most important ingredient in both the Pfizer and Moderna vaccines is mRNA. ![]() Read the information provided to the FDA. Yes, Pfizer, Moderna and Johnson & Johnson (Janssen) provided detailed information about the ingredients in their COVID-19 vaccines to the U.S. Are COVID-19 vaccine ingredients public? Is there a way to see what they're made of? Answer from infectious diseases expert David Brett-Major, MD, MPH ![]()
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