FIG. 2.

Kinetics of IgG antibody response in consecutive serum samples from nine representative patients. Each sample is represented by a circle. In addition to the IgG titers (y axis) a positive PCR is indicated by a black circle and a positive anti-dengue virus IgM response is indicated by a striped circle. Absence of IgM or RNA is indicated by a white circle. Patients 4, 12, and 21 had dengue virus type 1 infections; patients 1, 6, 9, 11, and 17 had type 2 infections; and patient 7 had a type 3 infection.