Table 3.
Results of laboratory investigations
| Sample collected | Number of Samples taken | Number of Positive samples | Remarks |
|---|---|---|---|
| Bacteriological examination of water in affected cookhouse | 02 | Nil | Normal coliform count |
| Bacteriological examination of water in adjacent cookhouse | 02 | Nil | Normal coliform count |
| Vomitus culture of cases | 12 | 11 | Coagulase positive S aureus growth |
| Stool RE of cases | 12 | 10 | 9 showed pus cells, 1 showed RBCs |
| Hanging drop preparation of stool | 12 | Nil | Negative for Vibrio |
| Stool culture of cases | 12 | 08 | Coagulase positive S aureus growth |
| Stool culture of food handlers | 05 | Nil | No growth observed |
| Nasal swab culture of food handlers | 05 | 01 | Coagulase positive S aureus in sample taken from first cook |
| Throat swab culture of food handlers | 05 | Nil | No microbial growth observed |
| Fingernail swab culture of food handlers | 05 | 02 | Coagulase positive S aureus in samples taken from masalchi and first waiter |
| Refrigerator swab culture | 02 | 02 | Coagulase positive S aureus in both samples |
| Kitchen floor swab culture | 02 | 02 | Coagulase positive S aureus in both samples |
| Kitchen shelf swab culture | 02 | 01 | Coagulase positive S aureus |