Middlesex, Essex and Hampshire Counties in Massachusetts were involved in confirmed equine disease reports.
Florida's 18th confirmed case of equine strangles was reported in Santa Rose County at a private facility.
This is the 17th confirmed case of equine strangles in Florida this year.
A property in Snohomish County, Washington, reported a confirmed case of equine strangles with eight horses exposed.
Seventy horses at the Suffolk Equestrian Academy were considered exposed to equine strangles when one horse was confirmed with the disease.
The Florida Department of Agriculture and Consumer Services confirmed an equine strangles case in Marion County, the 16th for the year in the state.
Horses at a boarding facility in Martin County and a private facility in Marion County are undergoing testing for equine strangles.
A pony in Martin County, Florida, was the 11th confirmed equine strangles case reported in Florida so far this year.
A Warmblood mare in Providence County, Rhode Island, was confirmed with equine strangles in early March.
Confirmed cases of equine strangles with other horses exposed occurred in Indian River and Martin Counties in Florida.