It was first described in areas surrounding the Potomac River northwest of Washington, D.C., in the 1980s, but cases have been described in many other parts of the United States, such as Minnesota, California, and Pennsylvania.
Potomac River | horse racing | Dark Horse Comics | Horse racing | Army of the Potomac | Saturday Night Fever | horse breeding | horse | horse trainer | Arabian horse | Crazy Horse | yellow fever | Trojan Horse | Potomac, Maryland | Potomac | Hay Fever | Master of the Horse | Badminton Horse Trials | Morgan horse | Yellow fever | The Horse Soldiers | Synthetic racetrack surfaces for horse racing | Royal Horse Artillery | Horse breeding | Horse | fever | Thoroughbred horse racing | The Horse and His Boy | Horse trainer | Andalusian horse |