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.
Culture-dependent characterization of the microbial community associated with epizootic shell disease lesions in American lobster, Homarus americanus.
Oct 01, 2005; ABSTRACT epizootic shell disease in the American lobster is an important factor affecting lobster fisheries in and around...