IMMUNOLOGY

Detailed explanation-1: -White blood cells are immune system cells. They are like warriors waiting in your blood stream to attack invaders such as bacteria and viruses. When fighting an infection, your body produces more white blood cells.

Detailed explanation-2: -Two major types of white blood cell disorders are proliferative disorders and leukopenias. In the proliferative disorders, there is an increase in the number of white blood cells. This increase is commonly a reaction due to infection, but may, less commonly, be related to some types of cancer.