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Questions about Polio Vaccine
Can polio be eradicated on stopping of polio vaccine?
Why didn't Jonas Salk patent the polio vaccine?
How did Salk discover the Polio vaccine?
How was the polio vaccine developed?
How much does two drops of polio vaccine costs?
How does the polio vaccine work?
Is the polio vaccine compulsory?
Is the Polio vaccine banned in the USA?
Why doesn't Nigeria allow the polio vaccine?
What is the polio vaccine called?