What is OPV vaccine for babies?

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  1. #usually
  2. #along
  3. #months
  4. #years
  5. #given
  6. #vaccine
  7. #poliovirus
  8. #child
  9. #receive
  10. #other
  11. #combination
  12. #fifth
  13. #inactivated
  14. #might
  15. #sometimes
  16. #vaccines