Innate immune system

The innate immune system is responsible for the body's initial, non-specific immune response following infection. It is capable of both providing a defence against infection by pathogens and triggering the adaptive immune response. Components of the innate immune system include:


 * The complement system
 * Phagocytes
 * Natural killer cells

Learn more

 * Wikipedia - Innate immune system
 * Crash Course - The Immune System Part 1