EBV genome loads in tonsillar B-cell subsets isolated by alternative sorting strategies. Duplicate samples from 2 chronic carrier tonsils (CCT12, 13) and from 3 IM tonsils (IMT3, 6, 8) were sorted independently using 2 different protocols. For each tonsil, (1) the top 3 bars indicate EBV genome loads in subsets isolated by CD38/IgD/CD27 sorting into purified naive (CD38⁻, IgD⁺,CD27⁻, □), isotype-switched memory (CD38⁻, IgD⁻, CD27⁺ gray bars), and CD38⁺ (■) B-cell subsets, and (2) the bottom 4 bars show corresponding data for subsets isolated by CD77/CD10/IgD sorting into CD10⁻, CD77⁻ non-GC cells that are IgD⁺ (□) or IgD⁻ (), CD77⁺ centroblasts and CD10⁺ CD77⁻ centrocytes (■). Viral loads are expressed as EBV genomes per 10⁶ cells.