Results
STERILE
Sixteen volunteers fulfilled the inclusion and exclusion criteria and were recruited into the study. The mean ± standard deviation of age was 30 ± 5.8 years old and 63% were female. The total number of blood agar was 464 plates from 224 experiments. All 16 room control agar plates did not grow any bacteria. The distributions of subjects according to the amount of bacteria in CFUs in all speaking scenarios and all silent scenarios were shown in Fig. Comparisons of the amount of bacteria in colony forming unit (CFU) between experimental and control blood agar plates in speaking and silent scenarios.The effects of wearing face masks, using fenestrated sterile drapes, or types of drapes were separately analysed (Fig. The distributions of subjects according to the amount of bacterial colony forming units comparing between wearing vs not wearing face masks, using vs not using fenestrated sterile drapes and using reusable vs disposable drapes in speaking and silent scenarios.A total of 87 bacterial CFUs grew on the blood agar plates (53 in experiment plates and 34 in control plates). Microbial strains identified in this study.