Experimental studies in human and mouse cells correlate defective monocyte/macrophage activation and migration with ineffective granuloma formation, and overexpression of interleukin (IL)-10 is present in patients with chronic Q fever (Meghari et al. 2008; Delaby et al. 2012; Bewley 2013; Mehraj et al. 2013; Ka et al. 2014). Here, IL10 is linked to Q fever.