Abstract
During a five-year period (1964–1968) the distribution of polioviruses in The Netherlands has been studied by virological examination of sewage samples collected monthly from 25 sewage purification plants in the first two, and from 40 sewage plants in the last three, years. The results were compared with those obtained from faecal specimens of healthy children in five day nurseries during the first two years, and from patients during the whole study period. The results suggest that sewage is the most suitable source of information on the circulation of polioviruses in a given community. A certain correlation between the isolation of poliovirus from human individuals and from sewage could be observed in given spaces of time. There were, however, also periods in which such a correlation was lacking, particularly when a low level of poliovirus circulation could be expected. The feasibility of virological examination of sewage in a poliomyelitis surveillance programme is discussed.
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