Gizelle15 Gizelle15

22-03-2017
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contestada

In the early 1950's dr Jonas Salk developed an effective vaccine for what childhood disease
A) polio
B)Measles
C)chicken pox
D)typhoid fever

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Аноним Аноним

22-03-2017

A) Polio. But you can also choose D if you don't think A is correct.

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KaraWheeler67 KaraWheeler67

22-03-2017

In the early 1950s Dr. Jonas Salk developed a vaccine for A) polio

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