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High‐Speed Cell Sorting of Infectious Trophic and Cystic Forms of Pneumocystis carinii
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ABSTRACT. The separation of Pneumocystis carinii life‐cycle stages while preserving infectivity is a hitherto unresolved challenge. We describe an original, reproducible, and efficient method for separating trophic from cystic forms of P. carinii using a high‐speed cell sorter. The large amounts of highly purified (99.6±0.3%) infectious trophic and cystic forms can now be used to elucidate the poorly understood P. carinii life cycle.