All of the following are true about the Herd Immunity for infectious diseases except :: (A) It refers to group protection beyond what is afforded by the protection of immunized individuals, (B) It is likely to be more for infections that do not have a sub-clinical phase, (C) It is affected by the presence and distribution of alternative animal hosts, (D) In the case of tetanus it does not protect the individual
Answer is B. Occurrence of clinical and subclinical infection in a community is responsible for herd immunity. Herd immunity is more for infections that have a subclinical phase. Ref: Park's Textbook Of Preventive And Social Medicine By K. Park, 19th Edition, Page 96; Park's Textbook Of Preventive And Social Medicine By K. Park, 18th Edition, Page 95