Images of bronchial epithelium from control (A-E) and asthmatic (F-J) subjects experimentally infected with RV16. A, F, Hematoxylin and eosin. Arrows in F mark corresponding RV16-, CD68-positive cells. B, G, Merged immunofluorescence image showing staining for RV16 capsid protein (red), CD68 (green), and DAPI, a nuclear stain (blue). Colocalization is yellow. C, H, CD68 staining. D, I, RV16 staining. E, J, Isotype control IgGs. (Original magnification, ×640). DAPI, 4′-6-Diamidino-2-phenylindole, dihydrochloride.