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Left-hand panel displays ex vivo IFN-gamma Elispot data from 4 individuals (SK378, SK383, SK167, and SK325) who were ex vivo Elispot negative at 2 time-points 3 months apart. Right-hand panel displays data from the same individuals following a cultured Elispot (14 day in vitro culture of PBMC with the ESAT-6 or CFP-10 peptides followed by IFN-gamma Elispot). All individuals had CD4 counts above 250.
