Spores are intact in <i>Drosophila</i> frass.

<p>Vegetative cells or spores of strain AN390 were fed to <i>Drosophila</i> and the frass was analyzed by DIC and fluorescence microscopy. A) DIC image of vegetative cells before ingestion. B) Fluorescence image of cells in A. C) DIC image of a flyspeck from <i>Drosophila</i> fed vegetative cells. Arrow indicates an intact vegetative cell. D) Fluorescence image of cells in C. E) DIC image of spores before ingestion. F) Fluorescence image of spores in E. G) DIC image of a flyspeck from <i>Drosophila</i> fed spores. H) Fluorescence image of cells in G. Scale bar = 5 microns.