* Capsule: A thick, gelatinous layer surrounding some bacteria. This capsule acts as a physical barrier, preventing the white blood cell from attaching to the bacterial surface.
* Cell Wall: The rigid outer layer of a bacterium can also contribute to resistance against phagocytosis. Some bacteria have cell wall components that make them difficult for white blood cells to engulf.
* Surface Proteins: Certain bacteria possess surface proteins that bind to receptors on white blood cells, effectively "disarming" them and preventing phagocytosis.
* Biofilms: Some bacteria form biofilms, a complex community of bacteria encased in a protective matrix. This biofilm structure provides a barrier against phagocytosis and other immune defenses.
It's important to note that these are not mutually exclusive. Bacteria often utilize multiple mechanisms to evade phagocytosis, making them more challenging for the immune system to eliminate.
