CRP and infection: After being exposed to norovirus, of the 219 measurements in subjects without infection, 194 (89%), 14 (6%), 1 (0.4%), and 10 (5%) were in reference (AGP ≤ 1 g/L and CRP ≤ 5 mg/L), incubation (AGP ≤ 1 g/L and CRP > 5 mg/L), early convalescence (AGP > 1 g/L and CRP > 5 mg/L), and late convalescence (AGP > 1 g/L and CRP ≤ 5 mg/L), respectively.