The microflora in the mammalian gut plays an essential role in maintaining the physiological states and pathological changes of the host, and it is of significance for host health to detect the microflora in the gut. However, the traditional staining methods for bacteria have some drawbacks, such as poor specificity, incompatibility with living cells, and susceptibility, thereby limiting further study on the morphology and function of intestinal microflora. The fluorescence imaging technique could accurately reveal the location of symbiotic, pa...