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What is polio and countries which are still effected by it?

+1 vote
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Please help me to find the answer of the following -

  1. What is Polio
  2. How is polio transmitted?
  3. What are the different strains of polio?
  4. List of countries still effected by Polio?
posted Apr 5, 2015 by Manish Tiwari

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