The results of a long-term survey of poliomyelitis in Kenya are reported. Virus was isolated from patients and a limited number of sera were also tested for antibodies. The purpose of the investigation was to elucidate the epidemiological characteristics of the disease and to determine whether epidemics could be predicted. A 3-year rhythm was found in the circulation of type 1 poliovirus, making possible the prediction and hence, on two occasions, the curbing or prevention of epidemics
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