After sampling from a 1m ³ UV disinfection aerosol cabinet, the plate was taken out using aseptic operation and incubated in a 36 ° C ± 1 ° C incubator for 48 hours to count viable bacteria. After completing the sampling of the experimental group and the positive control group, the unused same batch of culture medium was cultured simultaneously with the above two samples as the negative control. If there is bacterial growth in the negative control group, it indicates that the culture medium used is contaminated and the test is invalid. Replace the sterile equipment and repeat the test.