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vaccines a vaccine is a biological preparation that improves immunity to a particular disease 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
Michael Walsh Module 4 Definition - a vaccine is a substance used to stimulate the production of antibodies and provide immunity against one or several diseases. Where did the issue start - it started when vaccines became more commonly used. The Royal Jennerian Institute founded in 1803. Vaccines became popular in Europe and then came over and were used more in the U.S. in the 1870s is where strong opposition to vaccines started.