Table 3.
Influenza (Strain and Subtype) and Multiplex Results by age Group
| Virus Strain and Subtypes | <5 Years | 5–17 Years | 18–49 Years | 50–64 Years | 65–79 Years | 80+ Years | P for Temporal Trend |
|---|---|---|---|---|---|---|---|
| N (%) | 1149 (32.7) | 359 (10.2) | 769 (21.9) | 456 (13.0) | 504 (14.4) | 275 (7.8) | … |
| Influenza A/H1N1pdm09 | 663 (57.7) | 198 (55.2) | 337 (43.8) | 242 (53.1) | 216 (42.9) | 73 (26.5) | .024 |
| Influenza A/H3N2 | 407 (35.4) | 121 (33.7) | 327 (42.5) | 138 (30.3) | 189 (37.5) | 153 (55.6) | .452 |
| Influenza A unsubtyped | 85 (7.4) | 17 (4.7) | 78 (10.1) | 73 (16.0) | 86 (17.1) | 38 (13.8) | .132 |
| Influenza B Yamagata | 14 (1.2) | 8 (2.2) | 17 (2.2) | 11 (2.4) | 11 (2.2) | 13 (4.7) | .259 |
| Influenza B Victoria | 21 (1.8) | 6 (1.7) | 11 (1.4) | 0 (0.0) | 4 (0.8) | 0 (0.0) | .035 |
| Influenza B unsubtyped | 28 (2.4) | 12 (3.3) | 6 (0.8) | 0 (0.0) | 4 (0.8) | 0 (0.0) | .180 |
| Multiplex virus-virus codetectionsa | |||||||
| Human seasonal coronavirus type not specified | 8 (0.7) | 2 (0.6) | 3 (0.4) | 1 (0.2) | 4 (0.8) | 0 (0.0) | .259 |
| Not available | 119 (10.4) | 7 (1.9) | 67 (8.7) | 34 (7.5) | 28 (5.6) | 11 (4.0) | … |
| Metapneumovirus | 13 (1.1) | 1 (0.3) | 3 (0.4) | 3 (0.7) | 0 (0.0) | 0 (0.0) | .180 |
| Not available | 110 (9.6) | 14 (3.9) | 62 (8.1) | 28 (6.1) | 22 (4.4) | 11 (4.0) | … |
| RSV | 45 (3.9) | 2 (0.6) | 2 (0.3) | 3 (0.7) | 5 (1.0) | 3 (1.1) | .707 |
| Not available | 94 (8.2) | 12 (3.3) | 61 (7.9) | 28 (6.1) | 22 (4.4) | 11 (4.0) | … |
| Adenovirus | 6 (0.5) | 2 (0.6) | 1 (0.1) | 1 (0.2) | 0 (0.0) | 0 (0.0) | .085 |
| Not available | 174 (15.1) | 12 (3.3) | 67 (8.7) | 34 (7.5) | 28 (5.6) | 11 (4.0) | … |
| Bocavirus | 3 (0.3) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | .241 |
| Not available | 174 (15.1) | 12 (3.3) | 67 (8.7) | 34 (7.5) | 28 (5.6) | 11 (4.0) | … |
| Parainfluenza type not specified | 5 (0.4) | 2 (0.6) | 0 (0.0) | 0 (0.0) | 1 (0.2) | 0 (0.0) | .314 |
| Not available | 175 (15.2) | 12 (3.3) | 67 (8.7) | 34 (7.5) | 28 (5.6) | 11 (4.0) | … |
| Rhinovirus | 6 (0.5) | 5 (1.4) | 4 (0.5) | 4 (0.9) | 5 (1.0) | 1 (0.4) | .707 |
| Not available | 190 (16.5) | 14 (3.9) | 67 (8.7) | 34 (7.5) | 28 (5.6) | 11 (4.0) | … |
Abbreviations: RSV, respiratory syncytial virus.
a
Not all recruiting sites have run multiplex tests. For standardization purposes, the totality of laboratory-confirmed influenza cases was considered the denominator to estimate the proportions per age group.