Bacterial flagellum is the organ of bacterial movement, Helicobacter pylori is able to pass through the mucus layer on the gastric epithelial cells from the strongly acidic gastric lumen to reach the neutral environment of the gastric epithelial cells, which is a good example of the role of flagellar movement, flagellar staining can be observed flagellar morphology, the number of flagella and flagellum in the distribution of the location of the bacteria, the number of flagellum and the distribution of the location of the flagellum in the bacteria is one of the most important bases for identification of bacteria.

Flagellar staining solution (Leifson method) using the Leifson method, also known as Leifson's stain (Leifson's flagella stain) method, the reagent is more sensitive, the operation is simple, the results of the judgment is more reliable.