All of the following are true about the Herd Immunity for infectious diseases except :
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
It refers to group protection beyond what is afforded by the protection of immunized individuals
It is likely to be more for infections that do not have a sub-clinical phase
It is affected by the presence and distribution of alternative animal hosts
In the case of tetanus it does not protect the individual