active immunity
Active Immunity
Immunity is a state of having sufficient defensive force in your body to avoid any kind of infection, any attack of disease or any unwanted biological invasion. Active immunity is generated in the host by the antigen itself. The comparison between active and passive immunity will help you understand the concept easily. Just read on..
- Adaptive immunity is subdivided into two major types, naturally acquired immunity and artificially acquired immunity. Naturally acquired immunity is the immunity that is acquired through contact with pathogen, but the contact is not deliberate. Artificially acquired immunity is the immunity that is purposefully developed through deliberate actions such as vaccination.
- Both, naturally acquired and artificially acquired immunities are further subdivided into active and passive immunity, depending on whether immunity is induced in the host or passively transferred from a immune host.
- Immunity, that is named as active, is generated in the host by the antigen itself. It lasts much longer, sometimes life-long. Antigen is a substance like a toxin or enzyme which stimulates the immune response of the body by especially enhancing the production of antibodies by the immune system.
- You can develop passive immunity by acquiring antibodies or activated T-cells from an immune host. Your body "downloads" critical information about a wide range of pathogens in a managed way and uses it for defense mechanism! Passive immunity does not last longer - usually it lasts for a few months only.
- The basic adaptive immunity is also classified as humoral immunity and cell mediated immunity, depending upon the cells involved. Humoral immunity is said to be active when you generate your own antibodies and passive when you receive antibodies from other individuals. Similarly, cell mediated immunity is active when your own T-cells are stimulated and passive when T-cells come from another human being.