IL17A and viral infectious disease: In addition, deposition of hemosiderin in the spleen (Fig 3K and 3L) indicated an increase in activated macrophages, and a systemic inflammatory response after virus infection was demonstrated by a significant increase in cytokines such as IFN-γ, IP-10, and IL-17 in the serum on day 5 after MERS-CoV infection (Fig 5M).