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    • Potency status of oral polio virus vaccine among retrieved field samples in Kenya 

      Gachara, George; Hassan, J. A.; Mbugua, F.; Muchiri, J.; Symekhah, S.; Nakitari, G.; Borus, P.; Kamau, T.; Kombich, J. (Elsevier, 2014-04)
      Background: In 1988 the World Health Organization (WHO) proposed mass immunization campaigns with the trivalent oral polio vaccine (TOPV) among children less than 5 years of age. The Vaccine Vial Monitor (VVM) is a small ...