About herd immunity, all are true except
Elements which contribute to herd immunity are occurrence of clinical and subclinical infection in the herd immunization of the herd herd structure Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 110
Depends on clinical and subclinical cases
Influenced by immunization
Depends on the presence of alternative host
Herd immunity is constant
Epidemiology