IL2 and influenza: The leaf extracts can inhibit infection and proliferation of influenza A, H7N9, encephalitis B, mumps viruses, HSV-II, Dengue virus II, and Cytomegalovirus, among others (Ma, 2014; Zhou et al., 2006); directly neutralize and degrade endotoxin in actinomycin D-sensitized mice (Shi and Zhang, 2006) and promote interleukin 2 (IL-2) secretion by spleen lymphocytes induced by concanavalin A to enhance immunity in normal mice (Hsuan et al., 2009; Liang et al., 2000).