Table 2. Demographic characteristics of individuals detected positive and negative for respiratory syncytial virus, who were tested through the sentinel influenza surveillance system, Portugal, 2010–2018 (n = 6,455 persons)a .
| Demographic characteristicsb | Virus infectiona | |||
|---|---|---|---|---|
| RSV-positive cases | RSV-negative cases | |||
| n | % | n | % | |
| Age group in years | ||||
| 0–4c (n = 171) | 23 | 12.6 | 148 | 2.4 |
| 5–14 (n = 585) | 8 | 4.4 | 577 | 9.3 |
| 15–64 (n = 4,652) | 107 | 58.5 | 4,545 | 73.6 |
| ≥ 65c (n = 951) | 45 | 24.6 | 906 | 14.7 |
| Total (n = 6,359) | 183 | 100.0 | 6,176 | 100.0 |
| Sex | ||||
| Male (n = 2,698) | 66 | 35.1 | 2,632 | 42.1 |
| Female (n = 3,736) | 122 | 64.9 | 3,614 | 57.9 |
| Total (n = 6,434) | 188 | 100.0 | 6,246 | 100.0 |
RSV: Respiratory syncytial virus.
a Of 6,523 individuals included in the study, those with mixed infections (n = 68) were excluded in this Table.
b Cases with missing age or sex were excluded from the analyses by age or sex respectively. Age was missing for seven RSV-positive and 89 RSV-negative cases; sex was missing for two RSV-positive and 19 RSV-negative cases.
c Observed frequencies were higher than expected among these age groups: 0–4 and ≥ 65 years (p < 0.0001).