Viral load in C-case dengue virus (DENV) infections by serotype. Serum viral load is displayed as log₁₀ copies per milliliter. Mean viral load is represented by a black line. Viral load observed in DENV-2 infections was significantly lower than in DENV-1 (P = .003) or DENV-3 (P = .02). Abbreviation: DENV, dengue virus.