Disease elimination is helped by-
Ans. is 'a' i.e., Herd immunity o If the herd immunity is sufficiently high, the occurrence of an epidemic is regarded as highly unlikely.o If that high level of immunity is maintained and stepped up, by an on-going immunization programme, to the point where the susceptible persons are reduced to a small proportion of the population, it may lead to elimination of the disease in due course.o This has been achieved in such diseases as diphtheria and polio.
Herd immunity
Isolation
Quarantine
None
Infectious Disease Epidemiology