Table 1.
Characteristics of Reported HFMD Cases in Shenzhen, 2008–2011 (n = 64 428)
| Characteristics | 2008 | 2009 | 2010 | 2011 | Total (proportion%) |
|---|---|---|---|---|---|
| Population (million) | 8·77 | 8·91 | 10·36 | 11·69* | — |
| Annual attack rate (%) | 0·82 | 1·03 | 2·25 | 2·12 | — |
| Mortality rate (1/100 000) | 0·01 | 0·06 | 0·06 | 0·05 | — |
| Severe case | (P = 0·000) | ||||
| No | 7146 (99·9%)† | 9124 (99·6%) | 23 211 (99·6%) | 24 662 (99·4%) | 64 143 (99·6%) |
| Yes | 4 (0·1%) | 37 (0·4%) | 92 (0·4%) | 152 (0·6%) | 286 (0·4%) |
| Fatal case | (P = 0·393) | ||||
| Yes | 1 | 5 | 6 | 6 | 18 (0·02%) |
| No | 7149 | 9156 | 23 297 | 24 808 | 64 410 (99·98%) |
| Sex | (P = 0·021) | ||||
| Female | 2575 (36·0%) | 3330 (36·3%) | 8736 (37·5%) | 9011 (36·3%) | 23 652 (36·7%) |
| Age group (years) | (P = 0·000) | ||||
| <1 | 906 (12·7%) | 1323 (14·4%) | 3000 (12·9%) | 3617 (14·6%) | 8846 (13·7%) |
| 1–<2 | 1795 (25·1%) | 2623 (28·6%) | 6680 (28·7%) | 7633 (30·8%) | 18 731 (29·1%) |
| 2–<3 | 1484 (20·8%) | 2058 (22·5%) | 4653 (20·0%) | 5031 (20·3%) | 13 226 (20·5% |
| 3–<4 | 1291 (18·1%) | 1516 (16·5%) | 4145 (17·8) | 4106 (16·5%) | 11 058 (17·2%) |
| 4–<5 | 755 (10·6%) | 788 (8·6%) | 2199 (9·4%) | 2182 (8·8%) | 5924 (9·2%) |
| ⩾5 | 919 (12·9%) | 853 (9·3%) | 2626 (11·3%) | 2245 (9·0%) | 6643 (10·3%) |
| School | (P = 0·000) | ||||
| Yes | 2443 (34·2%) | 2110 (23·0%) | 5917 (25·4%) | 5629 (22·7%) | 16 099 (25·0%) |
| No | 4707 (65·8%) | 7051 (77·0%) | 17 386 (74·6%) | 19 185 (77·3%) | 48 329 (75·0%) |
| Migratory status | (P = 0·000) | ||||
| Local | 3273 (45·8%) | 3330 (36·3%) | 7926 (34·0%) | 8201 (33·3%) | 22 730 (35·3%) |
| Migrant | 3877 (54·2%) | 5831 (63·7%) | 15 377 (66·0%) | 16 613 (67·0)) | 41 698 (64·7%) |
| Residential district | (P = 0·000) | ||||
| Luohu | 1579 (22·1%) | 1604 (17·5%) | 2893 (12·4%) | 3041 (12·3%) | 9117 (14·2%) |
| Futian | 761 (10·6%) | 697 (7·6%) | 1753 (7·5%) | 1747 (7·0%) | 4958 (7·7%) |
| Nanshan | 794 (11·1%) | 752 (8·2%) | 2094 (9·0%) | 1627 (6·6%) | 5267 (8·2%) |
| Bao'an | 1791 (25·0%) | 1685 (18·4%) | 4040 (17·3%) | 4234 (17·1%) | 11 750 (18·2%) |
| Longgang | 2049 (28·7%) | 4188 (45·7%) | 11 896 (51·0%) | 13 479 (54·3%) | 31 612 (49·1%) |
| Yantian | 176 (2·5%) | 235 (2·6%) | 627 (2·7%) | 686 (2·8%) | 1724 (2·7%) |
| Laboratory results‡§ | (P = 0·000) | ||||
| EV71 | 121 (65·1%) | 66 (74·2%) | 112 (65·9%) | 118 (72·0%) | 417 (68·5%) |
| COX A16 | 62 (33·3%) | 21 (23·6%) | 57 (33·5%) | 25 (15·2%) | 165 (27·1%) |
| Other enterovirus | 3 (1·6%) | 2 (2·2%) | 1 (0·6%) | 21 (12·8%) | 27 (4·4%) |
| Overall reports | 7150 | 9161 | 23 303 | 24 814 | 64 428 |
*
Estimation based on population statistics in 2010.
†
Values in parentheses represent the proportion within each year.
‡
Results based on cases that have been tested and confirmed in the Virology Laboratory of Shenzhen Centre for Disease Control & Prevention only.
§
n = 609 for laboratory viral tests.