Stomatitis outbreak continues to grow
13, 2005
The earlier-than-normal
outbreak of vesicular stomatitis (VS) in the Southwest has grown to include
29 confirmed cases in horses from 23 premises in six counties representing
three states, according to USDA’s Animal and Plant Health Inspection
Service as of June 6.
The counties infected with the disease so far are Maricopa, Pinal and
Yavapai counties in Arizona; Grant and Luna counties in New Mexico; and
Travis County in Texas.
Five more infections were confirmed over the week ending June 5, one of
those infections was confirmed in Texas. However, it was in a horse that
was recently transported into the state from Arizona, according to officials
from the Texas Animal Health Commission (TAHC). Three of the 23 infected
premises—two in Arizona and one in New Mexico—have been released
from quarantine due to animals not showing additional symptoms 30 days
after being treated.
This year’s first VS cases were confirmed April 27 in two horses
in New Mexico. That was the earliest confirmed infections in documented
history by two months, animal health officials said.
State veterinarian offices have urged producers to take note of livestock
shipping and handling requirements that other non-infected states may
have imposed.
“A number of states and countries impose strict testing, permitting
and inspection requirements for livestock that originate from VS-affected
areas or states. Check with the state or country of destination before
hauling livestock from Texas,” said Dr. Bob Hillman, head of TAHC
and the Texas state veterinarian.
Hillman also said the clinical signs of VS mirror those of hoof-and-mouth
disease (HMD). Horses are susceptible to VS, but not HMD. However, both
diseases can affect cattle, sheep, goats, swine, deer and a number of
other species.
“When sores or blisters are seen in HMD-susceptible animals, we
must immediately rule out an introduction of HMD,” Hillman said.
“When horses have lesions, a VS test rules out other possible causes
for blisters and sores, including toxic plants, chemicals or poison.”
The disease has had a history of occurring very sporadically in the U.S.,
with outbreaks generally following a 10- to 15-year cycle. In l982-83,
the country suffered its worst recorded VS outbreak, when infection was
confirmed on 617 premises in nine states—Arizona, New Mexico, Colorado,
Utah, Wyoming, Idaho, Montana, Nebraska and South Dakota.
Subsequent outbreaks occurred in l995, l997 and l998 but were limited
to Arizona, New Mexico, Colorado and Texas. Last year, Texas had 15 cases,
New Mexico 80, and Colorado 199.
Colorado and other neighboring states have not yet been hit by the disease.
However, state animal health officials have said the lingering wet weather
conditions this spring have left the possibility for an even greater outbreak
of the disease very likely.
Livestock owners and private veterinary practitioners are urged to report
suspected cases of VS to their respective state livestock health regulatory
agency. — Steven D. Vetter, WLJ Editor
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