Table 4. Confirmation of anti-DENV IgG positive ELISA results, Haiti, 2012.
| IgG Positive Cases | Haitians* | Expatriates | Total | |||
| n = 121 | n = 41 | n = 162 | ||||
| n | % | n | % | n | % | |
| With recent infection (anti-DENV IgM positive)† | 9 | 7.4% | 7 | 17.1% | 16 | 9.9% |
| No recent infection, tested by microneutralization | 42 | 34.7% | 34 | 82.9% | 76 | 46.9% |
| No recent infection, not tested by microneutralization | 70 | 57.9% | 0 | 0.0% | 70 | 43.2% |
| Micronetralization results** | n = 42 | n = 41 | n = 59 | |||
| Positive | 42 | 100.0% | 17 | 50.0% | 59 | 77.6% |
| DENV cross reactive | 30 | 71.4% | 11 | 32.4% | 41 | 53.9% |
| DENV-1 | 1 | 2.4% | 1 | 2.9% | 2 | 2.6% |
| Primary DENV-1 | 0 | 0.0% | 1 | 2.9% | 1 | 1.3% |
| DENV-2 | 8 | 19.0% | 3 | 8.8% | 11 | 14.5% |
| DENV-3 | 3 | 7.1% | 0 | 0.0% | 3 | 3.9% |
| DENV-4 | 0 | 0.0% | 0 | 0.0% | 0 | 0.0% |
| Primary DENV-4 | 0 | 0.0% | 1 | 2.9% | 1 | 1.3% |
| Negative | 0 | 0.0% | 17 | 50.0% | 17 | 22.4% |
*42 specimens were randomly selected from the 121 IgG-positive Haitians (95% confidence interval [CI]: 94.5%–100%).
†
Samples that were anti-IGM ELISA positive were not tested by microneutralization since they were considered recent DENV infections.
** DENV cross reactive = positive neutralization titers to more than one DENV serotype without a four-fold difference between DENV serotypes to determine the predominant serotype; Primary DENV = reactivity to only one DENV serotype.