Incidence rates of infectious intestinal disease (IID) in the community and presenting to general practice by organism, and ratios to national surveillance, IID2 Study, UK 2008–2009
| Organism | Community | Presenting to general practice | Reported to national surveillance | |
| Rate* (95% CI) | Rate* (95% CI) | Rate* (95% CI) | ||
| Bacteria | ||||
| C perfringens | A | 1.5 (0.5 to 3.9) | 0.2 (0.1 to 0.5) | 0.001 (0 to 0.001) |
| Reporting ratio† | 2518.7 (890.7 to 7179.4) | 419.1 (181.9 to 962.8) | 1.0 | |
| Campylobacter | A | 9.3 (6 to 14.3) | 1.3 (0.9 to 1.8) | 0.997 (0.989 to 1.005) |
| Reporting ratio† | 9.3 (6 to 14.4) | 1.3 (0.9 to 1.8) | 1.0 | |
| E coli O157 VTEC | A | 0.3 (0 to 4.3) | 0.0 (0 to 0.1) | 0.042 (0.04 to 0.043) |
| Reporting ratio† | 7.4 (0.5 to 104.4) | – | 1.0 | |
| Salmonella | A | 0.6 (0.2 to 2.4) | 0.2 (0.1 to 0.4) | 0.133 (0.13 to 0.136) |
| Reporting ratio† | 4.7 (1.2 to 18.2) | 1.4 (0.6 to 3.3) | 1.0 | |
| Protozoa | ||||
| Cryptosporidium | B | 0.7 (0.2 to 2.7) | 0.2 (0.1 to 0.5) | 0.086 (0.084 to 0.089) |
| Reporting ratio† | 8.2 (2.1 to 31.7) | 2.3 (1 to 5.6) | 1.0 | |
| Giardia | B | 0.8 (0.2 to 3) | 0.1 (0 to 0.3) | 0.061 (0.059 to 0.063) |
| Reporting ratio† | 14.0 (4 to 49) | 1.5 (0.5 to 4.5) | 1.0 | |
| Viruses | ||||
| Adenovirus | C | 10.2 (6.8 to 15.4) | 0.8 (0.5 to 1.5) | 0.055 (0.053 to 0.057) |
| Reporting ratio† | 184.5 (122 to 279.3) | 15.3 (8.8 to 26.3) | 1.0 | |
| Astrovirus | D | 5.3 (3 to 9.4) | 0.4 (0.2 to 0.8) | 0.003 (0.003 to 0.003) |
| Reporting ratio† | 1763.5 (970.1 to 3218.1) | 135.1 (65.5 to 278.9) | 1.0 | |
| Norovirus | D | 47.0 (39.1 to 56.5) | 2.1 (1.4 to 3) | 0.164 (0.011 to 0.02) |
| Reporting ratio† | 287.6 (239.1 to 346) | 12.7 (8.8 to 18.3) | 1.0 | |
| Rotavirus | C | 12.7 (8.7 to 18.4) | 1.4 (0.9 to 2.1) | 0.296 (0.232 to 0.268) |
| Reporting ratio† | 42.9 (29.5 to 62.4) | 4.6 (3 to 7) | 1.0 | |
↵* Cases per 1000 person-years.
↵† The reporting ratios represent the ratio of rates in the community and presenting to general practice relative to the rate of reports to national surveillance. Enteroaggregative E coli and sapovirus are omitted from this table, as data on these organisms are not routinely collected at national level in all UK countries.
A, culture; B, enzyme immunoassay; C, ELISA and/or PCR; D, PCR; VTEC, verocytotoxin-producing E coli.