<prompt> Herd immunity provides protection to -Immunized personsNon immunized personsBothNone  <response>: Ans. is b i.e., Non-immunized person Herd immunity It is the level of resistance of a community or group of people to a paicular disease. It occurs when the vaccination of a poion of the population or herd provides protection to unprotected non-vaccinated individuals. How does herd immunity provide protection to nonimmunized person ? o Infection is spread from person to person. o If a large number of population are immune, it is more difficult to maintain a chain of infection. o The more immune individuals present in a population, the lower the likelihood that a susceptible person will come into contact with an infected individual. o For example, if person A had a disease and exposed person B who was immune because of vaccination, person B would not get ill and could not pass on the disease to person C when he comes into contact with him. So, even if person C is not vaccinated, He indirectly gets protection from the disease. o Hence herd immunity may be used to reduce spread of an infection and to protect a vulnerable, un-vaccinated subgroup. 