IL10 levels in Q fever patients. IL10 was evaluated in 397 sera including 24 sera from 5 patients with lymphoma, 250 sera from 48 patients with lymphadenitis, 112 sera from 26 patients with acute Q fever without valvulopathy and without progression to persistent focalized infection and 11 healthy controls. Median and interquartile range. The horizontal line corresponds to the maximum level observed in 11 healthy controls (12 pg/mL). *P < .05, ***P < .0005, ****P < .00005. Bilateral Mann-Whitney test. A gradient was observed suggesting that patients with lymphadenitis without lymphoma may represent a prelymphoma condition.