Vaccine Meaning. Definition of vaccine. PA Images Alamy Stock Photo.
Mar 04 2021 COVID-19 mRNA Vaccines Will Be Rigorously Evaluated for Safety. Jan 05 2021 Vaccine efficacy is the percentage reduction in a disease in a group of people who received a vaccination in a clinical trial. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe its toxins or one of its surface proteins.
MRNA vaccines have been held to the same rigorous safety and effectiveness standards 332 KB 24 pages external icon as all other types of vaccines in the United States.
It usually consists of a small amount of a killed weakened or otherwise modified version of a disease such as a virus or bacterium. An antigenic preparation of a typically inactivated or attenuated see attenuated sense 2 pathogenic agent such as a bacterium or virus or one of its components or products such as a protein or toxin. Jul 10 2018 French authors writing about Jenners work soon after his books publication used the word vaccine alone as a term for cowpox and vaccin a masculine derivative of vaccine as a term for the cowpox inoculum. A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease.
