- Herd immunity may be defined as proportion of persons with immunity in a given population.
- Complete eradication of disease can be achieved through herd immunity
- Once herd immunity is achieved it cannot be reversed.
- Smallpox is only disease for which global eradication has been achieved using herd immunity.
- Herd immunity is applicable only for virus based contagious diseases.
Which of the above statement/s is/are correct?