“Immune” is derived from “Immunis” a latin word, which means“safe”. Immunity, in lay terms means a state of being protected from a disease (especially an infectious disease).

Babies are born with some natural immunity, which they get from their mother. But, this gradually wears off as the baby’s own immune system begins to develop. Therefore, the baby now requires extra protection against illnesses.

This process of creating immunity (or protection) to a specific disease in an individual is known as ‘Immunisation’.

Immunisation may be mainly of two types:

  • Active immunisation in which the body produces anti-bodies to fight against infection for which vaccination has been done.
  • Passive immunisation in which the body gets protection by readymade anti-bodies through direct injection of immunoglobulin.