Interactions of A fumigatus conidia and germ tubes with endothelial cells. Photomicrographs of endothelial cell monolayers infected with A fumigatus H237 conidia (A-C) and germ tubes (D-F) after 30 minutes (A,D), 3 hours (B,E), and 8 hours (C,F). Original magnification × 20. Arrows indicate the organisms.