[Answer] 1. April 12, 1955 - Dr. Jonas Salk announced to the world on this date that a vaccine now existed to prevent which disease, a childhood scourge that killed and disabled many, even affecting president Franklin Delano Roosevelt of the United States?

Step 1 : Introduction to the question "1. April 12, 1955 - Dr. Jonas Salk announced to the world on this date that a vaccine now existed to prevent which disease, a childhood scourge that killed and disabled many, even affecting president Franklin Delano Roosevelt of the United States?"

...1. Rubella 2. Smallpox 3. Polio 4. Measles Poliomyelitis was a childhood disease that in its more serious instances would cause paralysis. After the vaccine for it came out, it was largely eradicated, cut down from hundreds of thousands of cases to a few thousand per year over the past few decades.

Step 2 : Answer to the question "1. April 12, 1955 - Dr. Jonas Salk announced to the world on this date that a vaccine now existed to prevent which disease, a childhood scourge that killed and disabled many, even affecting president Franklin Delano Roosevelt of the United States?"

Polio:

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