Defining an epizootic can be subjective, depending in part on what is "expected". An epizootic may be: a) restricted to a specific locale (an outbreak), b) general (an "epizootic") or c) widespread (panzootic). Because it is based on what is "expected" or thought normal, a few cases of a very rare disease (like a TSE outbreak in a Cervid population) might be classified as an "epizootic," while many cases of a common disease (like lymphocystis in Esocids) would not.
Common diseases that occur at a constant but relatively high rate in the population are said to be "enzootic." An example of an enzootic disease would be the influenza virus in some bird populations or, at a lower incidence, the Type IVb strain of VHS in certain Atlantic fish populations.
Assessing the climatic potential for epizootics of the gypsy moth fungal pathogen Entomophaga maimaiga in the North Central United States.(Report)
Oct 01, 2009; Introduction Substantial reductions in gypsy moth, Lymantria dispar (L.) (Lepidoptera: Lymantriidae), defoliation in the...