COVID-19 vaccine
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Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work!COVID-19 vaccine, any of various suspensions that contain either modified messenger RNA (mRNA), recombinant proteins, or immune-stimulating components of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the cause of coronavirus disease 2019 (COVID-19). The vaccine, administered by intramuscular injection, is intended to prevent COVID-19, which is characterized mainly by fever and respiratory symptoms, such as difficulty breathing. The first COVID-19 vaccines were developed and made available to the public under emergency use authorization in 2020, amid the COVID-19 pandemic. Multiple COVID-19 vaccines have been developed. Some of the first agents included mRNA-based vaccines made by the pharmaceutical and biotechnology companies ...(100 of 400 words)