Abstract
Dip samples were found inferior to swab samples especially for detecting virus in sewage plant effluents. Sponges exposed for 24 hours were found at least as efficient as 48 hours' swabs and as gauze swabs. Double sampling revealed many virus mixtures. The two-hour adsorption technique by the inoculation did not reveal more virus positive samples than one fifth the volume, which was not removed. Two blind passages were found useful, and as single celltype for isolations HeLa cells were found superior to monkey kidney cells.
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