Bacterial staining and microscopic examination
According to previously published methods (Devriese et al., 2005; Song et al, 2020), the pathogenic bacterial was cultured in glass dishes with solid medium and the single colony was inoculated aseptically into the clean glass slides, evenly smeared and fixed, then stained with Gram staining reagents, and examined under a microscope for describing the morphological characteristics of the pathogenic bacterial.