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Background Oral polio vaccine can rarely lead to Vaccine-associated paralytic poliomyelitis (VAPP). Case characteristics A 2-year-old child with asymmetric paralysis of lower limbs following first booster of oral polio vaccine; type 2 Vaccine-derived poliovirus (VDPV) isolated. Subsequently, the child was diagnosed to have common variable immunodeficiency. Outcome Paralysis gradually improved...
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