Table 1.
Characteristics of the active and passive surveillance networks, Peru*
| Variable | Type of surveillance | |
|---|---|---|
| Active | Passive | |
| Site of participant evaluation | Home | Medical clinic |
| Study years | 2006–2011 | 2002–2011 |
| TT performed on consecutive days | Yes | No |
| No. persons recruited | 1,095 | 12,453 |
| No. (%) persons without dengue | 656 (60) | 7,350 (59) |
| No. (%) persons with dengue | 439 (40) | 5,103 (41) |
| Method of dengue diagnosis, no. (%) | ||
| Culture+ (regardless of PCR/ELISA results) | 217 (49) | 2,693 (53) |
| PCR+/culture– (regardless of ELISA results) | 95 (22) | 183 (3) |
| ELISA+/culture–/PCR– | 127 (29) | 2,227 (44) |
| Serotype, no. (%)† | ||
| DENV-1 | 5 (2) | 12 (1) |
| DENV-2 | 84 (27) | 325 (11) |
| DENV-3 | 29 (9) | 1728 (60) |
| DENV-4 | 194 (62) | 811 (28) |
| Age, years, no. (%)‡ | ||
| 0–10 | 131 (12) | 992 (8) |
| 11–20 | 378 (35) | 3,990 (32) |
| 21–30 | 221 (20) | 3,348 (27) |
| 31–40 | 116 (11) | 1,975 (16) |
| 41–50 | 111 (10) | 1,221 (10) |
| 51–60 | 80 (7) | 657 (5) |
| > 60 | 55 (5) | 266 (2) |
| Sex, no. (%) | ||
| M | 454 (41) | 6,166 (50) |
| F | 641 (59) | 6,287 (50) |
*
TT = tourniquet test; PCR = polymerase chain reaction; ELISA = enzyme-linked immunosorbent assay; DENV = dengue virus.
†
Serotype information was available only for persons given a diagnosis by culture or PCR.
‡
Age information was not available for 3 active surveillance and 4 passive surveillance persons.