Salk, while working at the Virus Research Lab at the University of Pittsburgh, developed a polio vaccine, and the checkup trials to prove its effective ness and safety are still being analyzed. Fifty years ago the largest health check experiment in history took place to test Salks poliomyelitis vaccine. Close to two million children across the fall in States and Canada were involved in the trial, which was administered by the National Foundation for jejune Paralysis (...If you want to get a full essay, ordain apart it on our website: OrderEssay.net
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