Serum IFN-γ levels after Mtb72F/AS02A vaccine administration. Serum from subjects vaccinated with 10 μg Mtb72F/AS02A and 40 μg Mtb72F/AS02A were obtained on the day of vaccination (days 0, 28, 56, and 308), 1 day later (days 1, 29, 57, and 309), and 6 days later (days 6, 34, and 62) and were evaluated using ELISA to measure serum levels of IFN-γ. Data are represented in box-and-whiskers plots with a line at the median response and lower and higher quartiles. Whiskers indicate minimum and maximum responses.