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Two seed pools of rhinovirus were contaminated accidentally at different times with the same virus. This contamination was detected only in certain ‘spinner flask’ experiments under circumstances which suggested the possibility that a mechanism other than contamination was responsible for the appearance of this virus. Experiments were made to test some of these possible mechanisms, but the results strongly indicated a contamination. The circumstances under which this contamination probably occurred are discussed.

Contamination of Rhinovirus Seed Pools Revealed in HEp2 Cell Suspension Cultures