| Probable organism | Frequency of isolates % |
| E. coli | 29.3 (22) |
| Klebsiella spp. | 26.7 (20) |
| Proteus spp. | 16.0 (12) |
| Pseudomonas spp. | 28.0 (23) |
| Total number of probable organisms | 100 (75) |