Table 1. Characteristics of the study populations.
| Patient Characteristicsa | Number (n) |
| Number of patients (samples collected) | 80 (80) |
| Category of infection | |
| Primary acute DENV infectionb | |
| DENV-1 | 5 |
| DENV-3 | 2 |
| Secondary acute DENV infectionc | |
| DENV-1 | 7 |
| DENV-3 | 11 |
| Othersd | 55 |
a
History of previous flavivirus infection of each patient was not determined.
b
DENV infection was confirmed as described in Materials and Methods. Primary DENV infection was defined as serum samples that were negative for neutralizing to all of the four DENV serotypes at serum dilution of 1∶10.
c
DENV infection was confirmed as described in Materials and Methods. Secondary DENV infection was defined as serum samples that were positive for neutralizing to any of the four DENV serotypes at serum dilution of 1∶10.
d
A total of 55 serum samples from 55 non acute dengue patients were used. Serum samples were derived from the following categories: DENV genome and NS1 antigen negative (n = 34), and chikungunya virus (CHIKV) genome positive (n = 21).