IL6 and infection: Several reports show elevated levels of IL-6 in DHF/DSS (Huang et al., 2000; Rachman and Rinaldi, 2006; Restrepo et al., 2008; Priyadarshini et al., 2010; Butthep et al., 2012; Cruz Hernandez et al., 2016; Masood et al., 2018; Wang et al., 2019) and in both (Arias et al., 2014), and the discrepancy might be due to infection by different serotype.