IL6 and visceral leishmaniasis: Furthermore, multiple studies have shown a correlation between the high level of some cytokines, including IL-6, and the severity of visceral leishmaniasis (Ansari et al., 2006; Van Den Bogaart et al., 2014; Dos Santos et al., 2016; Ramos et al., 2016) and cutaneous leishmaniasis (Latifynia et al., 2012; Espir et al., 2014).