Table 3.
Influenza‐associated excess pneumonia and influenza hospitalizations among children <5 years of age in Suzhou, 2005 to 2011
| Predominant type or subtypea | Excess number of P&I hospitalizations per year(95% CI) | Excess P&I hospitalization rate per 1000 person‐year (95% CI) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 0 mo < 6 mo | 6 mo < 2 y | 2 y < 5 y | 0 mo < 5 y | 0 mo < 6 mo | 6 mo < 2 y | 2 y < 5 y | 0 mo< 5 y | ||
| 2005–2006 | A/H1N1 | 728.0 (338.0 to 1118.0) | 213.2 (15.6 to 416.0) | −124.8 (−223.6 to 26.0) | 816.4 (270.4 to 1372.8) | 14.6 (6.8 to 22.4) | 1.2 (0.1 to 2.4) | −0.5 (−0.8 to 0.1) | 1.7 (0.6 to 2.8) |
| 2006–2007 | A/H3N2 | 332.8 (−67.6 to 438.0) | 613.6 (322.4 to 904.8) | 109.2 (−78.0 to 291.2) | 1060.8 (317.2 to 1799.2) | 6.5 (−1.3 to 8.5) | 3.9 (2.1 to 5.8) | 0.6 (−0.4 to 1.5) | 2.6 (0.8 to 4.5) |
| 2007–2008 | B | 551.2 (−124.8 to 1222.0) | 660.4 (10.4 to 1305.2) | 270.4 (−26.0 to 572.0) | 1476.8 (67.6 to 2891.2) | 10.4 (−2.4 to 23.1) | 4.2 (0.1 to 8.4) | 1.2 (−0.1 to 2.6) | 3.4 (0.2 to 6.7) |
| 2008–2009 | A/H3N2 | 317.2 (−348.4 to 982.8) | 265.2 (−374.4 to 910.0) | 712.4 (301.6 to 1128.4) | 1300.0 (−46.8 to 2646.8) | 5.9 (−6.5 to 18.2) | 1.5 (−2.1 to 5.2) | 2.8 (1.2 to 4.4) | 2.7 (−0.1 to 5.5) |
| 2009–2010 | A/H1N1pdm09, B | 1705.6 (940.7 to 2474.9) | 1752.9 (1017.3 to 2488.6) | 1671.7 (1247.1 to 2096.3) | 5132.4 (3858.4 to 6406.4) | 31.0 (17.1 to 45.0) | 9.2 (5.3 to 13.1) | 5.8 (4.4 to 7.3) | 9.6 (7.3 to 12.0) |
| 2010–2011 | A/H1N1pdm09, A/H3N2 | 1558.9 (868.4 to 2256.8) | 1326.0 (655.2 to 1996.8) | 1201.2 (436.8 to 1965.6) | 4087.2 (2542.8 to 5636.8) | 29.5 (16.4 to 42.7) | 8.1 (4.0 to 12.2) | 4.8 (1.7 to 7.9) | 8.8 (5.5 to 12.1) |
| 2005–2011 | 5193.7 (1606.3 to 8492.5) | 4831.3 (1646.5 to 8021.4) | 3840.1 (1657.9 to 6027.5) | 13873.6 (7009.6 to 20753.2) | 16.4 (5.1 to 26.9) | 4.8 (1.6 to 7.9) | 2.6 (1.1 to 4.1) | 4.9 (2.5 to 7.4) | |
a
Data obtained from the influenza virological surveillance network surrounding the Suzhou area (Shanghai, Jiangsu, and Zhejiang).