MEDICINE
INFECTIOUS DISEASES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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polio.
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stroke.
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diabetes.
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tuberculosis.
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Detailed explanation-1: -THE VACCINE In 1954, Salk undertook a large-scale national study, enrolling over one million paediatric subjects. The next year, on 12 April 1955, he announced the results: the vaccine was both safe and efficacious. Subsequent data showed that in 1955, there were approximately 29, 000 cases of poliomyelitis in the US.
Detailed explanation-2: -With these words on April 12, 1955, Dr. Thomas Francis Jr., director of the Poliomyelitis Vaccine Evaluation Center at the University of Michigan School of Public Health, announced to the world that the Salk polio vaccine was up to 90% effective in preventing paralytic polio. Dr.
Detailed explanation-3: -The results were announced on 12 April 1955, and Salk’s inactivated polio vaccine (IPV) was licensed on the same day.
Detailed explanation-4: -Salk was new to polio research. His wartime work on influenza virus used “killed virus”. For polio, he used this same approach, applying tissue culture methods, recently developed. By 1954 it proved effective against all three strains of poliovirus.