Types of white blood cells
T cells destroy infected u a pathogen.
B cells produce proteins that stop pathogens from infecting body cells, it called antibodies.
Types of proteins in immune system
Complement proteins weaken pathogen's cell membrane. Then water enter the cell and burst it.
Interferons are proteins produced by body cell that have been infected by a virus.
Immunity prevents a person from getting sick from a pathogen.
But there are two types of immunity:
Passive immunity is immunity that occurs without your body having a virus. It comes from mother's milk and in our DNA.
Active immunity refers to the process of exposing the body to an antigen to generate an adaptive immune response and it takes time.