Vaccination

• Vaccination involves introducing small quantities of dead or inactive forms of a pathogen into the body to stimulate the white blood cells to produce antibodies. If the same pathogen re enters the body, the white blood cells respond quickly to produce the correct antibodies, preventing infection.
• Benefit of vaccinating a large proportion of a population against a pathogen

  Vaccinating a large proportion of a population against a pathogen reduces the spread of the pathogen to people who can’t or won’t be vaccinated, or weren’t vaccinated successfully. This is called herd immunity