Immune system

The immune system is primarily formed by the innate immune system which we are born with, and the adaptive immune system which learns how to fight pathogens (for example from vaccines, or infections we contract).

Innate immune system
Innate immune system

Barriers
Mucosal immune system

Adaptive immune system
Adaptive immune system

Chronic fatigue syndrome
There is evidence of immune dysregulation in chronic fatigue syndrome.

Reduced natural killer cell function.

Elevated regulatory T cells

Learn more

 * Crash Course - The Immune System Part 1 (Adaptive immune system)
 * Crash Course - The Immune System Part 2 (humoral immunity & B cells)
 * Crash Course - The Immune System Part 3 (cell-mediated immunity & T cells)