Northumberland and Durham counties are now affected.
The Larimer County premises is under official quarantine.
The horses from separate premises recently traveled together to an event in Scottsdale, Arizona.
Officials have cleared Blackwood’s training barn A.
Over the past few decades veterinarians and researchers have investigated major EHV-1 outbreaks in the U.S. to learn more about how to contain and prevent future occurrences.
In the wake of EHV at Pimlico, approval is needed to move horses onto Kentucky tracks.
The horse’s boarding facility has been placed under voluntary quarantine.
Ontario Ministry of Agriculture and Food has enacted a voluntary quarantine on the facility.
No further cases were reported at the Santa Clara County premises within 14 days.
All six affected horses survived the potentially deadly virus.
Pimlico and Laurel Park have suspended racing to mitigate EHV cases.
The state does not presently have any EHV-1 cases or quarantines in effect.
One barn released from quarantine, with additional barn to be retested later this week.
The case, located at the Winter Equestrian Festival, is unrelated to either of the state’s previous outbreaks this year.
Release of the index horse follows the release of the premises on March 24.
Any nasal drainage can be an important indicator of a horse’s health and can even herald an emergency. Learn about 6 snotty nose scenarios and possible causes.
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