The global switch from trivalent oral polio vaccine to bivalent oral polio vaccine: Facts, experiences and lessons learned from the south-south zone: Nigeria, April 2016

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The global switch from trivalent oral polio vaccine (tOPV) to bivalent oral polio vaccine (bOPV): facts, experiences and lessons learned from the south-south zone; Nigeria, April 2016.

https://bmcinfectdis.biomedcentral.com/articles/10.1186/s12879-018-2963-6