If you have a high enough antibodyA chemical produced by a lymphocyte in response to an antigen. level to protect you against a particular infection, you are immune.
Active immunity
This is when the body is activated and produces the antibodies needed to fight an infection.
Active immunity is:
Slow acting
Provides long-lasting protection
The primary response when a microorganism enters the body is described as natural active immunity.
vaccineA substance that stimulates the body to produce antibodies to provide immunity against a disease. provide artificial active immunity.
Passive immunity
This is when ready-made antibodies, from another source, are introduced to the body.
Passive immunity is:
Fast acting
Only lasts a short period of time
Breastfeeding provides a baby with natural passive immunity.
Anti-venom provides artificial passive immunity after a poisonous bite.