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The invention of the vaccine did not begin until the mid-1950s, but by 1961 polio was virtually eradicated. The first vaccine was invented by Dr. Jonas Salk. At this point, when he was just working at the Roosevelt Foundation, scientists already knew how to clone the virus on monkey kidney cells and use antibiotics to clean the bacteria. For his part, Salk decided to take formalin and test monkey immunity. In 1952, the scientist used a vaccine for himself and his wife and three sons. Hagrid with the sorting hat poster. The vaccine has been shown to be safe and does not cause allergic reactions. In 1954, Salk received a license to immunize 5,000 US students in Pittsburgh. Subsequent analysis revealed the presence of antibodies in the blood of the students and that his vaccine was the first effective vaccine against polio.

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