Table 1.
Viruses Isolated From Children ≤59 Months With Medically Attended Acute Respiratory Infection During Four Influenza Seasons
| Age Group (Months) |
||||
|---|---|---|---|---|
| Characteristic | 6–11 | 12–23 | 24–59 | Total |
| No. tested | 313 | 759 | 1411 | 2483 |
| No. with conclusive multiplex results | 306 | 739 | 1339 | 2384 |
| No. (%) with any virus infections | 242 (79.1) | 586 (79.3) | 1058 (79.0) | 1886 (79.1) |
| RSV | 92 (30.1) | 214 (29.0) | 321 (24.0) | 627 (26.3) |
| Influenza | 23 (7.5) | 59 (8.0) | 232 (17.3) | 314 (13.2) |
| MPV | 26 (8.5) | 64 (8.7) | 146 (10.9) | 236 (9.9) |
| Rhinovirus | 91 (29.7) | 217 (29.4) | 278 (20.8) | 586 (24.6) |
| Coronavirusa | 31 (10.1) | 84 (11.4) | 106 (7.9) | 221 (9.3) |
| Parainfluenza virusb | 26 (8.5) | 70 (9.5) | 114 (8.5) | 210 (8.8) |
| Adenovirusc | 4 (1.3) | 6 (0.8) | 33 (2.5) | 43 (1.8) |
| No. (%) with single virus infections | 193 (63.1) | 469 (63.5) | 897 (67.0) | 1559 (65.4) |
| RSV | 61 (19.9) | 156 (21.1) | 238 (17.8) | 455 (19.1) |
| Influenza | 15 (4.9) | 46 (6.2) | 189 (14.1) | 250 (10.5) |
| MPV | 19 (6.2) | 45 (6.1) | 116 (8.7) | 180 (7.6) |
| Rhinovirus | 61 (19.9) | 136 (18.4) | 182 (13.6) | 379 (15.9) |
| Coronavirusa | 18 (5.9) | 39 (5.3) | 71 (5.3) | 128 (5.4) |
| Parainfluenza virusb | 16 (5.2) | 44 (6.0) | 85 (6.3) | 145 (6.1) |
| Adenovirusc | 3 (1.0) | 3 (0.4) | 16 (1.2) | 22 (0.9) |
| No. (%) with coinfection | 49 (16.0) | 117 (15.8) | 161 (12.0) | 327 (13.7) |
| RSV and Influenza | 2 (0.7) | 2 (0.3) | 17 (1.3) | 21 (0.9) |
| RSV and noninfluenza viruses | 29 (9.5) | 56 (7.6) | 66 (4.9) | 151 (6.3) |
| Influenza and non-RSV viruses | 6 (2.0) | 11 (1.5) | 26 (1.9) | 43 (1.8) |
| Other coinfections | 12 (3.9) | 48 (6.5) | 52 (3.9) | 112 (4.7) |
| No. (%) negative for all viruses | 64 (20.9) | 153 (20.7) | 281 (21.0) | 498 (20.9) |
| No. missing data for all virus targets | 7 | 20 | 72 | 99 |
Abbreviations: MPV, metapneumovirus; RSV, respiratory syncytial virus.
a Subtypes 229E, HKU1, OC43, and NL63.
b Parainfluenza virus types 1–4.
c Adenoviruses B and E.