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In the early 1950s, Dr. Jonas Salk developed an effective vaccine for what childhood disease? A) polio Eliminate B) measles C) chicken pox D) typhoid fever

In the early 1950s, Dr. Jonas Salk developed an effective vaccine for what childhood disease? A) polio Eliminate B) measles C) chicken pox D) typhoid fever
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In the early 1950s, Dr. Jonas Salk developed an effective vaccine for what childhood disease? A) polio Eliminate B) measles C) chicken pox D) typhoid fever

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User Mher
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A) polio eliminate hope this helps
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User Shahar Bental
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