Epizootic

n. disease which spreads quickly among animals (Veterinary Medicine)

adj. spreading quickly among animals (Veterinary Medicine)

In epizoology, an epizootic (from Greek epi- upon + zoion animal) is a disease that appears as new cases in a given animal population, during a given period, at a rate that substantially exceeds what is "expected" based on recent experience (i.e. a sharp elevation in the incidence rate). (An epidemic is the same term applied to human populations.) High population density is a major contributing factor to epizootics, with aquaculture being an example of an industry sometimes plagued by disease because of the large number of fish confined to a small area.
See more at Wikipedia.org...

Ep·i·zo·ot·ic adj. Affecting a large number of animals at the same time within a particular region or geographic area. Used of a disease. [more]Epizootic - Community and Resources

Adjective
1. (of animals) epidemic among animals of a single kind within a particular region; "an epizootic disease"
(similar) epidemic
(classification) animal, animate being, beast, brute, creature, fauna

(n.)
An epizootic disease; a murrain; an epidemic influenza among horses.
  

(a.)
Of the nature of a disease which attacks many animals at the same time; -- corresponding to epidemic diseases among men.
  

(a.)
Of or pertaining to an epizoon.
  

(a.)
Containing fossil remains; -- said of rocks, formations, mountains, and the like.