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Analysis of the dynamics of Pneumocystis carinii in vitro.

Three culture systems employing mammalian lung cell monolayers were evaluated in terms of their ability to support the replication of primary isolates of rat-derived Pneumocystis carinii. For each system, analysis of variance was used to identify changes in the numbers of P. carinii over time. Significant replication was consistently demonstrated over lung fibroblasts (MRC-5), however, increases perceived in the culture supernatant were clearly influenced by the density of the underlying monolayer.