<prompt> All of the following are true about the Herd immunity for infectious disease exceptIt refers to group protection beyond what is afforded by the protection of immunized individualsIt is likely to be more for infections that do not have a sub clinical phaseIt is affected by the presence and distribution of alternative animal hostsIn the case of tetanus it does not protect the individual  <response>: 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, Parks Textbook of Preventive and Social Medicine, Page no. 110 