Vaccines are diluted suspensions of killed, living, or attenuated micro-organisms
or their component or their metabolic products, that are used as antigens to produce immunity against infection caused by these microorganisms
When injected in a normal healthy person, vaccine-induced antibodies provide acquired immunity against subsequent infection from that specific micro-organism.
The injection of vaccine is called a ‘shot’.
the shot involves the injection of an attenuated microorganism Whose violence is weakened Are ability to cause disease is lost,
but it is capable of inducing body formation.
the use of vaccines has been effective in developing resistance to infection of microorganisms that cause