Table 1.

Characteristics of the Patient Population Sampled

Variable	Primary infection	Secondary infection
No. of patients	33	21
Age, years, mean ± SD	35.0 ± 12.8	33.9 ± 17.3a
Sex, no. of patients
Men	18	15
Women	15	6
No. of days illb, mean ± SD	3.3 ± 2.0	3.5 ± 1.7
Infecting serotypes
DENV-1	10	6
DENV-2	6	4
DENV-3	13	7
DENV-4	4	4

NOTE. ^a Data on the age of a patient with secondary infection (S9) was not available.

^bIndicates the no. of days after onset of disease at the time of blood collection.