Before revision: Endemic expected frequency of the disease within as area or population group may also refer to the usual Mathematical determination For an infection that relies on person-to-person transmission, to be endemic, each person who becomes infected with the disease must pass it on to one other person on average.
After revision: Mathematical determination For an infection that relies on person-to-person transmission, to be endemic, each person who becomes infected with the disease must pass it on to one other person on average.