Table 3.
Incidence estimates of laboratory-confirmed influenza hospitalisation among infants under 6 months of age from US-based influenza surveillance systems
| Influenza season reported | Surveillance system | ||
| EIP Rate per 10 000 population (95% CI) |
NVSN Rate per 10 000 population (95% CI) |
EIP and NVSN combined Rate per 10 000 population (95% CI) |
|
| Individual seasons | |||
| 2000–2001 | 24.0 (10.0 to 38.0)32
24.0 (10.0 to 39.0)9 |
||
| 2001–2002 | 43.0 (22.0 to 66.0)9 | ||
| 2002–2003 | 23.0 (9.0 to 38.0)9 | ||
| 2003–2004 | 29.6 (26.7 to 32.8)28 | 72.0 (53.0 to 92.0)9 | 91.2 (67.0 to 145.0)*30 |
| 2004–2005 | 12.8 (11.0 to 14.9)28 | 34.0 (25.0 to 45.0)8 | 43.8 (38.9 to 52.1)†31 |
| 2005–2006 | 12.1 (10.5 to 13.8)28 | 24.0 (10.0 to 40.0)8 | |
| 2006–2007 | 9.3 (7.9 to 10.9)28 | 20.0 (9.0 to 33.0)8 | |
| 2007–2008 | 16.2 (14.3 to 18.3)28 | 43.0 (25.0 to 63.0)8 | |
| 2008–2009 | 12.027 | 16.0 (7.0 to 26.0)8 | |
| 2009–2010 (H1N1 pandemic) | 20.2 (18.1 to 22.5)27 | ||
| Combined seasons | |||
| 2000–2004 | 43.029
45.0 (34.0 to 55.0)9 |
||
| 2004–2009 | 27.0 (21.0 to 33.0)9 | ||
*Individual estimates: EIP=34.5 per 10,000; NVSN=66.6 per 10 000.
†Individual estimates: EIP=17.4 per 10,000; NVSN=29.9 per 10 000.
EIP, Emerging Infections Program; NVSN, New Vaccine Surveillance Network.