IL6 and Thrombocytopenia: Few differences in cytokine concentrations were detected in association with specific symptoms, though vomiting and diarrhea were associated with higher IL-13 and IL-5 (both adjusted p ≤ 0.023) and thrombocytopenia was associated with higher IFN-γ, IL-10, IL-1β, IL-8, and IL-6 (all adjusted p ≤ 0.031) (S1 Table).