## 3 Results  
The overall contamination results of the two L-shaped frames and the medical personnel were the main outcomes, shown in Table 3. There were considerably more areas of contamination noticed on the two L-shaped frames and the PPE of the medical personnel without the aerosol box. The RT-qPCR results show the contamination of 10 locations: Nos. 0 and 9 were the outlets of commercial aerosol generators, and Nos. 1 and 2 were the locations of the medical personnel. Nos. 2-8 were on the two L-shaped frames. These locations are shown in Figure 2. The cleaning effect of the L-shaped frames were tested by using rubbing alcohol, which is often used to clean wounds and surgical instruments. The study results showed that the cleaning effect with disinfection was sufficient for reuse.  
Studies concerning speech-generated and breathing aerosols from patients with various respiratory infections have shown significant similarities in the size distributions of aerosols, with a majority of the organism in small particles (<5 um). These are immediately adapted for respiration, suggesting the need for intubation protection for medical personnel in proximity to potentially infected patients. Positive reference material was generated in the tent for 6 min. The particle numbers in the tent were measured, and particles of different sizes were detected, as shown in Figure 3. The smaller particles were found to be still in the air until the 15 th minute and then gradually disappeared. However, when the tent was removed at the 16 th minute, the number of smaller particles gradually increased.  
The contamination process was simulated with an aerosol generator. The study results showed that using the protection tent could decrease contaminations over the front and back body regions of medical personnel pre-doffing and post-doffing PPE. The protection tent is useful for containing the droplets, as shown in Figure 4a,b, showing that without the protection tent, fluorescent powder could be found in the neck regions when the medical personnel only wore a medical mask. The floor still had fluorescent powder after putting away the tent, as demonstrated in Figure 4c. The observed region was 1.5 m away from the tent. Before putting away the tent, the observed region did not show the fluorescent powder (image not shown). Finally, the measurement was repeated five times to calculate the fluorescent percent area using ImageJ.  
Particle analysis was used with a particle size of 0-infinity and a circularity of 0.0-1.0, with particle counting and percent area calculation, as shown in Figure 4d. The calculated percent area was 0.58% \(\pm\) 0.06%. The protection tent may prevent the secretions splashing and decreased the dispersion of aerosolized particles during the intubation procedure. However, medical personnel may still be exposed during the post-intubation period, especially when the protection tent is removed.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Location No.** & **With Tent** & **Without Tent** & \
\begin{tabular}{c} **With Disinfection** \\ **(after Testing)** \\ \end{tabular} &
\begin{tabular}{c} **Without Disinfection** \\ **(after Testing)** \\ \end{tabular} \\ \hline
0 & 3/3 & 3/3 & Not calculated & Not calculated \\
1 & 0/3 & 3/3 & 0/3 & 2/3 \\
2 & 0/3 & 3/3 & 0/3 & 1/3 \\
3 & 0/3 & 3/3 & 0/3 & 2/3 \\
4 & 0/3 & 3/3 & 0/3 & 3/3 \\
5 & 0/3 & 3/3 & 0/3 & 1/3 \\
6 & 0/3 & 3/3 & 0/3 & 2/3 \\
7 & 0/3 & 3/3 & 0/3 & 0/3 \\
8 & 0/3 & 3/3 & 0/3 & 1/3 \\
9 & 3/3 & 3/3 & Not calculated & Not calculated \\ \hline \hline \end{tabular}
\end{table}
Table 3: The RT-qPCR results under different conditions (positive case/total test times).