Comparison of RSV presentations in Western Australia (WA) in 2019 and 2020 by clinical phenotype and rates per age group in WA Metropolitan region
| Year | 2019 | 2020 | P value | |
| Total | 454 | 445 | ||
| Clinical phenotype | N (% total) | N (% total) | ||
| Bronchiolitis | 271 (59.7) | 181 (40.7) | <0.001 | |
| OALRI | 113 (24.9) | 145 (32.6) | 0.01 | |
| Wheeze responsive to salbutamol | 36 (7.9) | 80 (18) | <0.001 | |
| Other | 34 (7.5) | 39 (8.7) | 0.51 | |
| Median age in months (IQR) | 8.1 (2.3–20.7) | 16.4 (5.4–25.8) | <0.001 | |
| WA Metropolitan region | N (% total) | 382 (84.1) | 408 (91.6) | <0.001 |
| Under 12 months | N | 220 | 145 | |
| Rate per 1000 | 8.72 | 5.75 | <0.001 | |
| 95% CI | 7.61 to 10 | 4.9 to 6.8 | ||
| Between 12 and 24 months | N | 87 | 141 | |
| Rate per 1000 | 3.36 | 5.59 | <0.001 | |
| 95% CI | 2.7 to 4.1 | 4.7 to 6.6 | ||
| Between 24 and 48 months | N | 51 | 91 | |
| Rate per 1000 | 0.9 | 1.7 | <0.001 | |
| 95% CI | 0.7 to 1.2 | 1.4 to 2.1 | ||
N, number; OALRI, other acute lower respiratory tract infection; RSV, respiratory syncytial virus.