title: Circulation of a type 2 vaccine-derived poliovirus, Egypt.
mesh_terms: D004534:Egypt / Q000453:epidemiology; D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control / Q000635:transmission / Q000821:virology*; D017955:Poliovirus; D011159:Population Surveillance; D014611:Vaccination / Q000009:adverse effects / Q000379:methods