Question

What contribution did Jonas Salk make to science in the 1950s?

O A.
He invented DDT, the "miracle" pesticide.
• B.
He designed the first US satellite.
O c.
He developed smaller computers.
• D.
He created a vaccine against polio.




La respuesta es (D) the answer is D

Answer 1

Answer: The correct answer is D. He created a vaccine against polio.

Explanation: In 1954, Salk undertook a large-scale national study, enrolling over one million pediatric 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.