Table 1. Results of isolates identification by Vitek-2 compact system
| Identification result | Number of isolates |
| Clostridium difficile | 15 |
| Clostridium bifermentans | 4 |
| Clostridium sordellii | 4 |
| Clostridium tertium | 2 |
| Clostridium baratii | 1 |
| Clostridium glycollicum | 1 |
| Clostridium ramosum | 1 |
| Clostridium septicum | 1 |
| Non-Clostridium | 8 |
| Unidentified | 18 |
| Total | 55 |
The sample size was calculated on line (https://www.surveysystem.com/sscalc.htm#one) with confidence interval 6.32 at 95% confidence level and 250,000 Sakaka populations.