Arboviral (or arbovirus): [noun]
Any of several groups of viruses that are transmitted by bloodsucking arthropods (insects) such as ticks, fleas, or mosquitoes. The term comes from arthropd (AR) borne (BO) virus (VIRUS).
Native to a place or a specific fauna. West Nile Virus (WNV) and Eastern Equine Enchephalitis (EEE) are considered enzootic viruses in Massachusetts.
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). "Epidemic" is the analogous term applied to human populations.
An insect or other organism that transmits a pathogenic fungus, virus, bacterium, etc. Mosquitoes are vectors of WNV and EEE to humans and horses in Massachusetts.