F1 antigen: It is the most important outer membrane antigen of Yersinia pestis, which resists Yersinia pestis infection by prompting the human immune system to produce antibodies.

V antigen: Another common antigen of Yersinia pestis, which stimulates the immune system to generate an immune response against Yersinia pestis.

Membrane lipopolysaccharide: It is a special structure present on the cell membrane of Yersinia pestis, which can stimulate the immune system to produce antibodies.

Endotoxin A: It is one of the main components of Yersinia pestis endotoxin. It is highly toxic and can cause immune system reactions, leading to a variety of symptoms and damage.

U-type aerosol toxin: It is a toxin secreted by Yersinia pestis that can rupture infected host cells and release Yersinia pestis into the surrounding environment.

V-type aerosol toxin: It is another toxin secreted by Yersinia pestis. It has a similar effect to U-type aerosol toxin, but the specific mechanism is different.

Secretinase: It is an enzyme secreted by Yersinia pestis that can destroy the structure and function of host cells, thereby helping Yersinia pestis invade host cells.

Carbohydrase: It is another enzyme secreted by Yersinia pestis, which can decompose sugar acid and provide nutrients needed for survival and reproduction of Yersinia pestis.