TABLE 1.
Outline of four outbreaks caused by new enterotoxin-producing Clostridium perfringens
| Outbreak | Date of occurrence | Place of occurrence | No. of patients/no. of people at risk (%) | Preparing facility | Incriminated food | % of patients with diarrhea, abdominal pain (main clinical symptoms) | Incubation period (mean) in h | Serotype of causal bacteria |
|---|---|---|---|---|---|---|---|---|
| 1 | 12 October 1997 | Tokyo | 39/160 (24.3) | Restaurant | Boxed luncha | 97.4, 43.5 | 4–28 (15.5) | TW27 |
| 2 | 16 June 2003 | Tokyo | 9/11 (81.8) | Restaurant | Stewed lamb | 100.0, 33.3 | 7–20 (10.0) | TW27 |
| 3 | 15 August 2009 | Osaka | 84/420 (20.0) | Restaurant | Roast beef | 100.0, 74.7 | 2.5–26 (12.5) | TW27 |
| 4 | 2 January 2010 | Tochigi | 79/171(46.2) | Restaurant | Roast beef | 98.7, 67.1 | 3–24 (9.5) | TW21 |
a
Included rolled egg, fried lotus, boiled and seasoned beef with stringy konnyaku (devil's tongue), grilled salmon, broiled eel, lettuce leaves, orange, and a Japanese rice ball (Onigiri), prepared on 11 October 1997.