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4-26-2010
To Bob Hance, RMLA

To the best of my knowledge, the information on the report from the Colorado Department of Agriculture that you sent out is accurate and up to date.  Skunk rabies has been increasing in Colorado over the last several years and since the Summer of 2009, there have been cases in domestic livestock (cattle and horses).  Thus, there is heightened awareness and concern.  Although I have heard rumors of alpaca's or llama's getting rabies, I do not think that these are confirmed and as far as I know, the rumors of confirmed rabies cases in alpacas or llamas are false.  However, llamas and alpacas are still at risk.

Dr. Stacey Byers has prepared a poster on Rabies that we will have at the GWAS.  The area of greatest concern right now is in the counties that are seeing the cases, particularly Elbert county.  I think that all llama and alpaca owners should consider vaccinating their animals for rabies, particularly if they have observed or smelled skunks in the area.  There are no rabies vaccines currently labeled for llamas and alpacas.  So, even if you vaccinate, the animals will likely be quarantined if there is documented exposure to a rabid animal.  However, the available rabies vaccines are likely to provide some degree of protection even if they have not been tested in llamas and alpacas.  The vaccines that we are recommending for use in llamas or alpacas are IMRAB 3 or IMRAB Large Animal (Merial, Inc. but currently not available), Defensor 3 (Pfizer), Rabdomun or Prorab-1 (Intervet, Schering-Plough).  All of these vaccines are labeled for cattle or sheep.  The recommended dosing and administration is the same as for cattle or sheep and starts with an initial 2ml vaccination any time after 3 months of age followed with annual boosters.  The route is IM for all of the vaccines, however, IMRAB is also labeled for SQ administration.  

As far as rabies vaccine safety goes, there is no specific information.  Llama and alpaca owners on the east coast and other areas of the U.S. have been vaccinating their animals for many years and no problems specific to the rabies vaccine have been reported to the best of my knowledge.  

You can share this information with the RMLA.  I also attached a question/answer sheet that I used for a radio interview last October.  This information is mostly accurate other than there have been more reported cases in horses since that time.    

Regards,
Rob (Robert) J. Callan, DVM, MS, PhD, DACVIM
Service Head, Livestock Medicine and Surgery
Department of Clinical Sciences
Colorado State University
Fort Collins, CO 80523

 
           
 

2009-10-15
Rabies in Colorado radio interview
(Published here 4-26-2010)
Rabies in Colorado

1.      Rabies is becoming a much bigger concern in Colorado.  What has changed?

Previously, the main reservoir for rabies in Colorado was bats.  Livestock generally don't have much interaction with bats so the rabies risk was very low.  However, over the last 1 to 2 years we have seen a dramatic increase in skunk rabies in Colorado.  This year, it has become a particular concern around El Paso county.  A rabid skunk is more likely to interact with pets and livestock than bats and can bite them, spreading rabies.

2.      Have there been cases of rabies in livestock in Colorado?

Yes, in September there was a case of rabies in a horse near Black Forest and a case in a cow near Calhan, Colorado.  Both cases are believed to have been caused by skunk rabies.

3.      What type of signs do livestock or other animals with rabies show?

Rabies causes a central neurological disease so the primary signs are abnormal behavior or abnormal movement.  Any change in the behavior of an animal from being more friendly, to more aggressive could be an early indication of rabies.  As the disease progresses, they may show changes in their movement, they may seem lame or become uncoordinated.  While drooling is classically associated with rabies, it is not always seen.  The disease has a steady progression until the animal becomes recumbent.  Death generally occurs within 10 days of the initial signs.

4.      What should I do if I suspect an animal has rabies?

If it is a wild animal such as a skunk, raccoon, bear, mountain lion, bat or anything else, you should contact the Colorado Division of Wildlife.  Stay away from the animal and try to prevent contact with your pets or livestock.  If it is your pet or livestock, you should contact your veterinarian for an examination.

5.      How is rabies diagnosed?

At this time, rabies can only be confirmed in animals by examining brain tissue.  If rabies is suspected and the animal is euthanized or dies, then the head or brain tissue is submitted for fluorescent antibody testing.  This test detects the virus in the tissues.  The test takes about 1to 3 days for results.

6.      What happens if my livestock are exposed to rabies?

If the livestock are NOT vaccinated for rabies, then the exposed animals are either humanely euthanized immediately or the herd is quarantined for observation for a period of at least 6 months.  If the exposed animals have been vaccinated for rabies within the recommended period for the vaccine, then the animals are revaccinated immediately and placed under observation for a period of 45 days.

7.      How can I protect my livestock from rabies?

The best protection is vaccination.  This helps prevent rabies from developing in your livestock if they are exposed and thus helps to prevent possible exposure to humans in contact with the livestock.  The human contact aspect is particularly important for show animals.  Not all rabies vaccines are licensed for livestock so it is important to choose a correct vaccine.  If your animals are exposed to rabies, the Public Health Department will require that you have evidence of rabies vaccination so it is strongly encouraged that you work closely with your veterinarian in vaccinating your livestock and that you keep records of what animals were vaccinated.  Rabies is a heightened concern in Colorado and it is important that livestock producers discuss rabies prevention with their veterinarian.

     Robert J. Callan, DVM, MS, PhD, DACVIM

     Department of Clinical Sciences

     Colorado State University

 
           
           
   

media release

Colorado Department of Agriculture

 www.colorado.gov/ag

FOR IMMEDIATE RELEASE

April 15, 2010

Contact:   

Christi Lightcap, CDA, (303) 239-4190, Christi.lightcap@ag.state.co.us

Mark W. Salley, Colorado Department of Public Health and Environment, (303) 692-2013                

Horse Confirmed with Rabies in Colorado

LAKEWOOD , Colo. – The Colorado Department of Agriculture is encouraging livestock and pet owners to discuss animal health concerns, including the rabies vaccine, with their local veterinarian after a horse in eastern Arapahoe County tested positive for rabies.

"The department would like to stress two very important points," said State Veterinarian, Dr. Keith Roehr.  "One—animal owners need to be aware that rabies is transferring from one species to another and they should monitor their animals for symptoms; and two—local veterinarians are a valuable resource to help producers decide the best course of action to protect their livestock and pets from rabies."

According to the Colorado Department of Public Health and Environment, in 2009, there were a total of 103 rabies cases in 20 Colorado counties; one of those cases included a horse.  In September 2009, a horse in El Paso County was euthanized and subsequent tests determined the horse was infected with rabies; public health experts believe the horse was exposed in July 2009 to a skunk on its home property in the Black Forest area. 

As of April 12, a total of 28 animals have tested positive for rabies in Colorado in 2010: 25 skunks (13 from Elbert County), 1 domestic cat from Prowers County, 1 muskrat from Morgan County, and the 1 horse from eastern Arapahoe County.

Rabies is a viral disease infecting the brain and central nervous system. The clinical appearance of rabies typically falls into two types:  "aggressive" and "dumb."  Aggressive rabies symptoms include combativeness and violent behavior and sensitivity to touch and other kinds of stimulation.  There is also a "dumb" form of the disease in which the animal is lethargic, weak in one or more limbs, and unable to raise its head or make sounds because its throat and neck muscles are paralyzed.

Rabies can be passed from animals to humans.  Elisabeth Lawaczeck, state public health veterinarian at the Colorado Department of Public Health and Environment added, "The best way to protect your family from rabies is to keep your pets currently vaccinated for rabies through your local veterinarian, humane society, or animal shelter. Rabies vaccination performed by owners will not be recognized by local public health or animal control agencies for licensing or in the event of an exposure to a rabid animal."

Rabies is spread primarily through the bite of rabid animals, resulting in the spread of the disease through their infected saliva. Rabies also can be spread when saliva from an infected animal gets into open wounds, cuts or enters through membranes of the eyes, nose or mouth.  No cure exists for rabies once symptoms appear although there is a vaccine to prevent the infection.  Livestock and pet owners are urged to discuss the vaccine with their local veterinarian.

"Animal owners need to primarily look for any dramatic behavioral changes.  That is typically one of the hallmark signs that the animal may be suffering from rabies," said Roehr.

Examples of unusual behavior include: wild mammals that show no fear of people and pets; nocturnal animals that are active in daylight; and bats found on the ground, in swimming pools or that have been caught by a pet.  Rabid carnivores, such as skunks, foxes, bobcats, coyotes, dogs and cats, may become aggressive and may attempt to bite people, pets and livestock.

In addition to ensuring that pets and livestock are vaccinated properly against rabies, residents are encouraged to follow these prevention steps:

Don't feed wild animals or allow your pets around them. Be sure to teach children to stay away from wild mammals.

Contact your veterinarian if your dog or cat is bitten or scratched by a wild animal, such as a skunk, bat, fox or raccoon.

If you suspect you've been exposed to rabies, contact your physician without delay.

Discuss rabies vaccination of your livestock with your veterinarian. Vaccination should be considered for horses and other equines, breeding livestock, dairy cattle or other high-value livestock, especially in areas of the state where skunks have been diagnosed with rabies.

If you observe a wild mammal acting strangely, especially a skunk, or if you find a dead skunk that isn't on your property, stay away from it. Strange behavior for a skunk would include being out and about during daytime hours.

If you must remove a dead skunk on your property, wear rubber gloves or lift the carcass with a shovel or other tool, and double-bag it for the trash.

Do not allow pet dogs or cats to roam freely, as this increases the chance they may be exposed without your knowledge. Keep dogs in a fenced in yard.

Take precautions when camping, hunting or fishing. Avoid sleeping on the open ground without the protection of a closed tent or camper. Keep pets on a leash and do not allow them to wander.

   
   

Additional Resources

www.colorado.gov/ag/animals

 

http://www.cdphe.state.co.us/dc/zoonosis/rabies/

 

http://wildlife.state.co.us/Pages/Home.aspx

http://wildlife.state.co.us/WildlifeSpecies/LivingWithWildlife/

 

http://www.ext.colostate.edu/pubs/livestk/01819.html

http://dlab.colostate.edu/