Immunisation is an important method of disease prevention. By receiving a vaccination, usually in the form of an injection, a person can be 'immunised' against…
The acquired immune system's lymphocytes (T cells and B cells) attack antigens like bacteria and viruses, and create antibodies that prevent re-infection.
Fistulas (fistulae) are abnormal connections between two epithelial surfaces. Epithelial surfaces are present in hollow structures (such as blood vessels and organs) and comprise the…