[Two problems arising at the final stage of poliomyelitis elimination].
Se'ibil'
V B
VB
D003140:Communicable Disease Control / Q000592:standards*; D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D023321:Poliovirus Vaccines; D012426:Russia / Q000453:epidemiology; D014611:Vaccination / Q000592:standards; D014944:World Health Organization
D023321:Poliovirus Vaccines