Problem: Innate Immunity (also referred to as natural or native): present at birth, non-specific immunity - Acquired immunity: protection gained after birth through either active or passive immunity - Natural active acquired immunity: After introduction of a foreign antigen results in formation of antibodies or sensitized T lymphocytes - Artificial active acquired immunity: occurs with immunization - Artificial passive acquired immunity: occurs when receiving a specific transfusion. For example: immunoglobulin (Ig) - Natural passive acquired immunity: antibodies from a mother to fetus through the placenta or from the colostrum or breastmilk. (It is immediate but short lived) Need Assignment Help?