Table 1.
Prevalence of Symptoms in H1N1pdm Infected and Uninfected Subjects and “Symptomatic” and “Asymptomatic” Subjects in Targeted Surveillance.
| Symptom/s H1N | 1pdm Positive (%) N=50 | H1N1pdm Negative (%) N=564 | p-value | “Symptomatic” (%) N=251 | “Asymptomatic” (%) N=363 | p-value |
|---|---|---|---|---|---|---|
| Rhinorrhea | 82 | 31.2 | <0.001 | 75.3 | 7.7 | <0.001 |
| Cough | 80 | 32.8 | <0.001 | 82.1 | 5.2 | <0.001 |
| Fever | 78 | 19.3 | <0.001 | 59 | 0 | <0.001 |
| Sore throat | 38 | 16.8 | <0.001 | 40.2 | 3.6 | <0.001 |
| Headache | 34 | 15.6 | 0.018 | 28.3 | 9.4 | <0.001 |
| Diarrhea | 8 | 8.2 | 0.99 | 15.5 | 3 | <0.001 |
| Vomiting | 8 | 10.5 | 0.99 | 17.1 | 5.2 | <0.001 |
| Nausea | 8 | 10.3 | 0.99 | 28.3 | 9.4 | <0.001 |
| Myalgias | 6 | 2 | 0.58 | 4.8 | 0.6 | <0.001 |
| Seizure | 0 | 0.2 | 0.99 | 0 | 0.3 | 0.99 |
| Rash | 0 | 3.4 | 0.99 | 4.8 | 1.9 | 0.11 |
| Fever and cough (no sore throat) | 36 | 7.4 | - | 23.9 | 0 | - |
| Fever and sore throat (no cough) | 2 | 1.2 | - | 3.2 | 0 | - |
| ILI** | 68 | 15.4 | <0.001 | 48.2 | 0 | <0.001 |
| No ILI | 32 | 84.6 | - | 51.8 | 100 | - |
| “Symptomatic” | 90 | 36.5 | <0.001 | - | - | - |
| “Asymptomatic” | 10 | 63.5 | - | - | - | - |
*
“Symptomatic” subjects were those who met any two of the following criteria: fever, cough, sore throat, coryza, or myalgia
**
ILI was defined as presence of subjective fever with cough or sore throat.