Vesicular Stomatitis (VS) virus first showed up this year on July 18, when four horses in Weld County tested positive for the disease and were placed under quarantine.
“Fast forward five weeks,” said CSU Extension Agent Karen Crumbaker, “to August 28, when the Colorado Department of Agriculture confirmed 313 horses and 7 cows have tested positive for VS in Colorado, causing 222 quarantines. The spread of VS went from one county to eight, Larimer County being one of the counties with 56 quarantined locations.”