# What is the difference between active and passive immunity?

May 16, 2018

The main difference between the two types of immunity is that active involves $\textcolor{red}{\text{antigens}}$ and passive involves $\textcolor{red}{\text{antibodies}}$.
This kind of immunity is acquired when $\textcolor{red}{\text{antigens}}$ of a pathogen enter an individual's body and an immune response is triggered. $\textcolor{p u r p \le}{\text{Natural active immunity}}$ occurs when an individual contracts an illness naturally. For example, they may ingest the cholera virus through contaminated water. $\textcolor{p u r p \le}{\text{Artificial active immunity}}$ occurs when an individual is given a weakened form of a pathogen through a vaccine. In both cases, the immune response is triggered, culminating in the production of memory cells that protect the body if a second infection occurs.
This occurs when $\textcolor{red}{\text{antibodies}}$ enter an individual. These are essentially molecules that fight and destroy a specific pathogen's antigen. $\textcolor{p u r p \le}{\text{Natural passive immunity}}$ occurs when they pass to an infant through the mother's milk. $\textcolor{p u r p \le}{\text{Artificial active immunity}}$ occurs when the antibodies are injected into an individual. In both cases, the antibodies destroy the pathogen and grant the individual immunity.