Abstract
A clinical case of paralytic poliomyelitis with almost simultaneous isolation of two different types of poliovirus was investigated. A strain of poliovirus type I was isolated from the cerebrospinal fluid and a type 3 strain of poliovirus was isolated from the patient's faeces. Both strains were characterised by two-dimensional oligonucleotide mapping. The type I virus was shown to be of wild type while the type 3 virus was shown to be vaccine-associated.
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