Confirmed cases of West Nile virus (WNV) were reported in horses from Virginia, Iowa and California.
EEE has been reported in North and South Carolina and WNV was confirmed in New York.
Montcalm, Shiawassee and Wayne Counties in Michigan have confirmed cases of equine strangles.
Strangles quarantines are in place at the race track and a stable in Ontario County, New York.
On one property, a horse has tested positive for EHM and another has tested positive for EHV-1.
A barrel racing horse from Williamson County that attended several events has been diagnosed with EHM.
A horse in York County, Maine, was euthanized due to EHM.
Horses that attended high school rodeo events at Laramie, Rock Springs or Big Piney should be monitored.
An investigation is underway and the horse and on-premises contact animals have been quarantined.
The third confirmed case of EHM at the Orange County facility is in quarantine.
A quarantined barn that had a neurologic case of EHV-1 has had seven additional horses that tested positive for EHV-1 and had fevers, but no neurologic signs.
Barrel horse initially suspected of having rabies was euthanized due to neurologic herpesvirus.