Table 2.
Overall weekly test results of NHS Direct callers and individuals suspected of swine flu according to the clinical algorithm in six regions of England, 24 May to 30 June 2009
| Week ending Tuesday 2 June* | Week ending Tuesday 9 June | Week ending Tuesday 16 June | Week ending Tuesday 23 June | Week ending Tuesday 30 June | Five week summary | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| x/n | Proportion positive | 95% CI | x/n | Proportion positive | 95% CI | x/n | Proportion positive | 95% CI | x/n | Proportion positive | 95% CI | x/n | Proportion positive | 95% CI | x/n | Proportion positive | 95% CI | |
| Mildly affected | ||||||||||||||||||
| North East | ||||||||||||||||||
| Self obtained samples from NHS Direct callers† | 0/3 | 0% | 0% to 71% | 0/9 | 0% | 0% to 34% | 1/18 | 6% | 0% to 27% | 0/31 | 0% | 0% to 11% | 1/12 | 8% | 0% to 38% | 2/73 | 3% | 0% to 10% |
| Clinical samples from suspect cases of swine flu‡ | 0/12 | 0% | 0% to 26% | 25/88 | 25% | 19% to 39% | 9/160 | 6% | 3% to 10% | 10/193 | 5% | 3% to 9% | 18/204 | 9% | 5% to 14% | 62/657 | 10% | 7% to 12% |
| East Midlands | ||||||||||||||||||
| Self obtained samples from NHS Direct callers† | 0/4 | 0% | 0% to 60% | 0/23 | 0% | 0% to 15% | 0/39 | 0% | 0% to 9% | 1/29 | 3% | 0% to 18% | 1/26 | 4% | 0% to 20% | 2/121 | 2% | 0% to 6% |
| Clinical samples from suspect cases of swine flu‡ | 5/34 | 15% | 5% to 31% | 4/68 | 6% | 2% to 14% | 5/102 | 5% | 1% to 11% | 47/273 | 17% | 13% to 22% | 124/528 | 23% | 20% to 27% | 185/1005 | 18% | 16% to 21% |
| Moderately affected | ||||||||||||||||||
| East of England | ||||||||||||||||||
| Self obtained samples from NHS Direct callers† | 0/10 | 0% | 0% to 31% | 0/35 | 0% | 0% to 10% | 0/38 | 0% | 0% to 9% | 4/41 | 10% | 3% to 23% | 2/47 | 4% | 1% to 15% | 6/171 | 4% | 1% to 7% |
| Clinical samples from suspect cases of swine flu‡ | 23/62 | 37% | 25% to 50% | 6/100 | 6% | 2% to 13% | 19/164 | 12% | 7% to 17% | 116/428 | 27% | 23% to 32% | 232/813 | 29% | 25% to 32% | 396/1567 | 25% | 23% to 27% |
| South East | ||||||||||||||||||
| Self obtained samples from NHS Direct callers† | 0/15 | 0% | 0% to 22% | 0/59 | 0% | 0% to 6% | 0/73 | 0% | 0% to 5% | 3/66 | 5% | 1% to 13% | 8/64 | 13% | 6% to 23% | 11/277 | 4% | 2% to 7% |
| Clinical samples from suspect cases of swine flu‡ | 44/218 | 20% | 15% to 26% | 21/355 | 6% | 4% to 9% | 55/451 | 12% | 9% to 16% | 248/1182 | 21% | 19% to 23% | 350/1495 | 23% | 21% to 26% | 718/3701 | 19% | 18% to 21% |
| Severely affected | ||||||||||||||||||
| London | ||||||||||||||||||
| Self obtained samples from NHS Direct callers† | 0/17 | 0% | 0% to 20% | 0/69 | 0% | 0% to 5% | 3/65 | 5% | 1% to 13% | 10/99 | 10% | 5% to 18% | 21/91 | 23% | 15% to 33% | 34/341 | 10% | 7% to 14% |
| Clinical samples from suspect cases of swine flu‡ | 25/164 | 15% | 10% to 22% | 36/256 | 14% | 10% to 19% | 201/702 | 29% | 25% to 32% | 930/2523 | 37% | 35% to 39% | 1144/2545 | 45% | 43% to 47% | 2336/6190 | 38% | 37% to 39% |
| West Midlands | ||||||||||||||||||
| Self obtained samples from NHS Direct callers† | 0/6 | 0% | 0% to 46% | 2/57 | 4% | 0% to 12% | 8/113 | 7% | 3% to 13% | 12/144 | 8% | 4% to 14% | 14/82 | 17% | 10% to 27% | 36/402 | 9% | 6% to 12% |
| Clinical samples from suspect cases of swine flu‡ | 27/166 | 16% | 11% to 23% | 97/300 | 32% | 27% to 38% | 447/1275 | 35% | 32% to 38% | 897/2463 | 36% | 35% to 39% | 1111/2633 | 42% | 40% to 44% | 2579/6837 | 38% | 37% to 39% |
Exact binomial confidence intervals have been calculated for all data.
*NHS Direct self sampling initiated on 28 May 2009.
†Results from self obtained samples are by week of self swab.
‡Clinical samples from suspect cases of swine flu were tested by Health Protection Agency regional laboratory and are shown by week of swab.