FIG. 5.

Evidence for HIV infection of IPC in vivo. (a) In double-stain experiments without counterstaining of tonsillar tissues, uninfected CD123⁺ (black) IPC that lack p24 staining (red) can be identified (magnification, ×400). (b) p24⁺ (red) cells can be identified in the tonsils of an HIV-infected individual (magnification, ×400). (c) HIV⁺ IPC can also be seen that are CD123⁺ (black) and p24⁺ (red) in tonsil from an HIV-infected individual. (d) Multinucleated giant cells are also identified with CD123 (black) and p24 (red) staining.