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e. A vaccine is a biological preparation that provides active acquired immunity to a particular infectious or malignant disease. [1] The safety and effectiveness of vaccines has been widely studied and verified. [2] [3] A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed ...

Medical uses[ edit] The Janssen COVID‑19 vaccine is used to provide protection against infection by the SARS-CoV-2 virus in order to prevent COVID‑19 in people aged eighteen years and older. [21] [1] The vaccine is given by intramuscular injection into the deltoid muscle. The initial course consists of a single dose.

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The COVID-19 vaccination campaign in the United States is an ongoing mass immunization campaign for the COVID-19 pandemic in the United States. The Food and Drug Administration (FDA) first granted emergency use authorization to the Pfizer–BioNTech vaccine on December 10, 2020, [6] and mass vaccinations began four days later.