All of the following are true about the Herd immunity for infectious disease except
The herd structure not only involves host population belonging to the herd species but also the presence and distribution of alternative animal hosts and possible insect vectors as well as those environmental and social factors that or or inhibit the spread of infection from host to host Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 110
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
Epidemiology