Only a single antigenic type of EAdV1 has been isolated from horses with respiratory disease.
A second serotype, equine adenovirus type 2 (EAdV2) , has been isolated from the feces of foals with diarrhea.
The biophysical properties of EAdv are similar to those of adenovirus of other species.
Equine adenovirus are nonnenvelopen, 70 to 80 nm in diameter, and the capsid is composed of 252 capsomers ; 240 hexamers occupy the faces and edges of the 20