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Do We Need To Practice Social Distancing With Our Horses?

Social distancing, mask wearing, hand washing, and the dreaded nasal swab have become part of our normal life during the COVID-19 pandemic. The equine industry faces similar types of outbreaks, but placing a mask on a horse isn't feasible. However, there are ways to prevent disease spread within the equine community.

The recent increase in horses affected by herpesvirus neurologic disease in North America and Europe reminds us that herpesvirus (EHV-1) remains a constant threat for horses. The virus, which causes upper airway infection and abortion, is highly contagious and easily transmitted between horses. Although there are vaccines for this virus, these vaccines are not completely effective and do not protect against the neurologic form of the disease, which is often fatal. The best protection to limit the spread of this disease is appropriate biosecurity, including isolation and social distancing.

Like COVID-19, equine diseases such as equine herpesvirus and equine influenza are highly infectious and spread by contact or by inhalation of micro-organisms on particles in the air or water. When an infected horse coughs or sneezes, tiny particles are spread. Viral diseases can also be spread by horse-to-horse contact or by contamination on commonly touched surfaces. Bacterial diseases such as Strangles are also transmitted through contact—from horse to horse or by horses touching common areas such as watering systems, tack, and grooming equipment. Both viruses and bacteria can be spread by humans working with an affected horse and carrying it to other horses.

Keeping horses separated is one of the most important steps in biosecurity to help prevent disease spread. When an infectious disease is suspected or confirmed, all horses in the same facility or on the same premise are at risk of becoming infected. Keeping horses separated in stalls or at a separate facility is crucial to stop the transmission of diseases to other horses. With very contagious diseases like equine herpesvirus, a quarantine is often necessary to stop all horse movement and limit movement of people on the affected premises.

Social distancing only works if appropriate sanitation measures and careful separation of tools and equipment are in place while caring for infected horses. Just as hand washing is needed to help control Covid-19, it is important that hands, clothing and any objects that come in contact with more than one horse are sanitized between horses.

If a horse is suspected or confirmed to have an infectious disease, horse owners should employ the following protocol to help prevent disease spread.

Immediately isolate the horse showing signs of an infection.
Implement movement restrictions of the affected horse and possibly exposed horses until the situation is evaluated.
Contact your veterinarian or the event veterinarian and ask what you should do.
Inventory horses, identify and isolate potentially exposed horses, and immediately implement health monitoring: take temperature twice daily (a temperature above 101.5° F suggests the horse has an infectious disease) and observe for clinical signs of depression or abnormal behavior.
When more than one owner or caretaker is involved, establish communication with all parties.

Additional protocol detail is available here.

Science Sleuths: Infectious Or Contagious?

Infectious. Contagious. You have probably heard these words several times in your life, maybe even used them. While similar and related, they are often used interchangeably or incorrectly and there is a difference. The distinction between the two is this: All contagious diseases are infectious, but not all infectious diseases are contagious.

The literal definition of infectious is “the process or state of being infected with a disease.” And to infect means “to affect or contaminate someone or something with pathogenic microbial agents.” Pathogenic meaning disease producing, and microbial referring to viruses, bacteria or other microorganisms. To simplify infectious, it basically means germs get into the body and spread, causing sickness. Contagious diseases are infectious diseases that can be transmitted through direct bodily (close) contact with an infected individual or their bodily discharges, or an object or surface they have contaminated (i.e. COVID-19). Other infectious diseases, however, are transmitted indirectly such as by mosquitoes (malaria) or ticks (Lyme disease).

The Big Picture

Contagious diseases are spread by contact, while infectious diseases are spread by infectious agents. So when something is contagious, it is also infectious because some contact exposed you or your animal to the infectious agent. Something infectious however is not always contagious. Confused yet? You can be infected with food poisoning (you ate the potato salad that sat out in the sun), but food poisoning isn't contagious (you aren't going to pass your food poisoning to someone else or your animals with just a simple contact). Suppose you are near someone sneezing quite a bit and they have an obviously stuffy nose. Well, if you have contact with that person and then you develop the sniffles and sneezes, it was contagious. It was also infectious because the way sniffles and sneezes are contagious is usually through an agent such as a virus or bacteria. If that person's symptoms were caused by allergies though, they aren't contagious because you can't catch allergies.

Since disease is spread by pathogens such as viruses, bacteria, fungi, parasites and other microorganisms, biosecurity at your farm is key to prevention. Having a solid plan in place to keep pathogens away from your farm or property, animals and personnel is key. The major components for your program are (adapted from USDA-APHIS):

General Signs of Animal Diseases of Concern

Sudden, unexplained deaths in the herd or flock
Severe illness affecting a high percentage of animals
Blistering around an animal's mouth, nose, teats or hooves
Unusual ticks, maggots or other insects
Staggering, falling or central nervous system disorders
Abortions or still births

Control Access to Your Property

Have only one combined entrance and exit to your farm if possible.
Keep property gates locked at all times.
Make sure all visitors check with you prior to entering your property or visiting your animals.
If you have a large number of visitors, keep track of who visits your farm. Make sure all visitors sign in at arrival and sign out at departure.
Only allow essential vehicles and visitors to enter the farm and keep these vehicles in a separate area away from animals.

Biosecurity Precautions

When a new animal moves onto a farm, be sure that the health status and the source of the animal is known.
New animals or animals returning to a farm should be separated from the rest of the herd for approximately two weeks. This can be difficult in some cases. If you are unable to completely isolate the animals, keep them in a pen or stall farthest from the rest of the stock, keep feed and water buckets or bowls separate, avoid nose-to-nose contact with other stock. For horses or stock that need to be exercised or worked, remove other animals from the pen, arena or paddock and set up a time for the new stock to have access to the area.
Keep vehicles, such as milk, feed and livestock trucks, from driving through areas where animals are housed or feed is kept.
Wash hands thoroughly before/after handling livestock.
Ask visitors to provide information about recent farm and animal contacts; deny entry if they have been to an area or farm of concern.
Clothing worn on farms in other locations/countries should be washed.
All footwear should be disinfected before entering and after leaving an animal housing area.
Discourage visitors from walking through feed mangers and having physical contact with animals.
Report morbidity and mortality events to your local veterinarian or to the state veterinarian's office.

Provide Disposable Protective Clothing

Make sure visitors entering your farm have clean clothes or you can keep a supply of disposable clean coveralls and boot/shoe covers for visitors.
If you haul your own animals, wash your truck, clean and disinfect boots and change coveralls before returning to your farm.
In general, don't borrow or share equipment. In cases where there are no other options, clean and disinfect the equipment prior to use and make sure to repeat these steps prior to returning the items.
If it is necessary to be around the animals of another farm, consider wearing protective clothing such as coveralls, and boots that can be cleaned and disinfected before you enter the property and removed when you leave.

Provide Disinfectant for Incoming Visitors

Provide visitors with a tub of disinfectant and a brush for scrubbing shoes for use before they enter your property, or provide shoe covers.
Vehicles entering and leaving your property should be kept away from animal areas or have their tires washed with disinfectant.

Additional Steps

Control your companion animals and poultry.
Control pests such as rodents and wild life.
Keep garbage and other waste from supplies and animal housing.
Evaluate feed purchased or brought onto the property and fed to animals.
Practice security and cleanliness in feed storage.

The take home message.

With infectious diseases, it's all about spreading germs. They can be spread in many ways, such as through direct contact with an infected person or animal or by direct contact with a contaminated object, consumption of contaminated food (salmonella) or water (cholera) or exposure to disease carrying insects (West Nile, numerous others).

With contagious disease, it's all about contact. The bottom line: have a good biosecurity plan in place on your farm/veterinary practice. Good hygiene, solid insect and parasite controls as well as limiting contact with suspect or new animals/people can help cut down disease problems. If any issues are noted or arise, don't wait; call your veterinarian, state veterinarian or extension agent. USDA can be reached toll-free at 833-663-8732.

UK Gluck Center And Industry Leaders Responding To An Uptick Of Foal Diarrhea Cases

The first several months of the year make up the bulk of the busy foaling season in Central Kentucky, so when the region's farms and equine practitioners began noticing increases of diarrhea in foals ages two to seven days old, there was concern.

In response, the University of Kentucky Gluck Equine Research Center is using a portion of its existing Koller Emergency Funds, and the Kentucky Thoroughbred Owners and Breeders Foundation, Grayson-Jockey Club Research Foundation and Coolmore America are leading an effort to help provide additional funding, allowing research to begin immediately.

“Anytime we recognize an increased incidence in equine health cases, such as foal diarrhea, we prepare and mobilize to further our understanding of the health issue,” said David Horohov, chair of the Department of Veterinary Science and director of the Gluck Equine Research Center. “Early detection and rapid diagnostics are at the cornerstone of what drives our research approach.”

Foals commonly develop diarrhea a week to 10 days after foaling, and veterinarians and farm owners typically have the experience and tools to respond. According to the American Association of Equine Practitioners, it is important for a veterinarian to evaluate foals under a month old when they experience diarrhea because they can develop life-threatening dehydration in as few as six to eight hours. Neonatal or young foals have a digestive tract, similar to humans, where small intestines are responsible for much of their nutrition absorption. Dealing with this type of attack on the small digestive system heavily impacts foals, which is a big reason why the Gluck center will focus its research efforts on this issue.

A significant increase in the illness has affected some farms, while other farms have had few to no cases. In spite of these incidences, UK has not recognized a rise in reported mortality associated with these cases and continue to monitor the situation.

UK College of Agriculture, Food and Environment researchers have developed a multipronged research plan to help further the understanding of the problem.

One focus of this research plan is to expand scientists' knowledge of the foal gut environment. This will add to their understanding of neonatal gut bacteria and the effect of antibiotic treatment.

A second part of the research plan is to study the differences in mares and their foals on farms both with and without early neonatal diarrhea cases and the effect of antimicrobial drug treatment. Researchers will conduct this analysis through gene sequencing to determine an overview of type and diversity of gut microflora.

They will also use the data in this part of the study to gain insight into the effect of antimicrobial use in foals on the development of their gut microflora.

The third prong of the research will investigate a biotherapeutic approach on one farm. That farm is supplementing foals with home-fermented live yogurt instead of a commercial pre/probiotic. Research has shown that Lactobacillus spp. bacteria are among the first colonizers in the neonatal gut. Data from other species supports Lactobacillus spp. as promoting gut health and outcompeting pathogens in gut colonization.

In addition to the three studies, the UK Gluck Center and Veterinary Diagnostic Laboratory team has identified further potentially useful tests, including gene sequencing targeting identification of novel viruses and bacteria that may be present.

With limited Koller Emergency Funds available, the UK Gluck Equine Research Center is thankful for the additional dollars provided by the Kentucky Thoroughbred Owners and Breeders Foundation, The Grayson-Jockey Club Research Foundation and Coolmore America.

“The foundation members met March 15 and felt this research and timing was consistent with the sole mission of immediately responding to threats to the breeding industry in Central Kentucky. We are grateful to Gluck for accessing their emergency funds and everyone for responding so quickly.” said Jimmy Bell, chairman of the KTOB Foundation.

“Situations such as these highlight the relevance for a coordinated effort that can be led by our scientists at the Gluck Equine Research Center,” said Stuart Brown, veterinarian, Keeneland equine safety director and chair of the Gluck Research Foundation. “Our team mobilizes to work with equine practitioners and farms throughout the area, allowing us to further our understanding and develop our approach to work on these types of issues. We appreciate the opportunity to collaborate with other partners to enhance our abilities when issues like this arise.”

“We at Grayson-Jockey Club Research Foundation believe in supporting timely equine health for all horses at every stage of their lives, and foal diarrhea is proving to be a concern this year on Central Kentucky farms,” said Dell Hancock, chair of the foundation. “We are happy to help facilitate research to address this condition and thank the University of Kentucky's Gluck Equine Research Center for their commitment to the well-being of horses.”

Runny Nose: Nuisance Or Something More Serious?

With the rise in cases of both equine herpes virus and strangles in horses in the United States, horse owners and caretakers have every right to be on high alert to any changes in a horse's health or demeanor. Though some symptoms are always a red flag — like a horse who's unsteady on his feet — some symptoms can be caused by something far less sinister than an equine illness.

A horse with a runny nose is always something to note, but a bit more work may be required to determine its cause.

Look closely at discharge color, odor, quantity and consistency, as well as if there is anything in the discharge like dirt, debris or feed. Notice if the discharge is coming from one nostril or two, as well as the horse's demeanor. A check of his vital signs is in order.

If the horse's nasal discharge is clear and thin, and he's bright and acting normally, he most likely inhaled some dust or hay and has irritated his nasal passages, but is otherwise fine. A small trickle of bright red blood that stops bleeding in minutes is also most likely nothing to be concerned about—the horse probably got poked with a piece of stemmy hay.

The following require a call to the vet as they may indicate serious issues:

Discharge that includes saliva or chewed food, which could mean the horse is choking.
Bright red blood that is flowing freely for more than 30 minutes may be a sign of nasal passage injury.
Blood that is dark and draining could indicate that the horse has blood accumulating in his sinuses or respiratory tract.
Thick, yellow mucus can be a sign of a viral or bacterial infection, or strangles.
Discharge that smells, which may be indicative of an infection.

If the discharge indicates the horse may have an infection or contagious disease, keep him away from other horses and tell the vet what he or she may be dealing with before they arrive so they can adequately prepare. Don't handle any other horses before the vet arrives; if there's no other option, be sure to wash and sanitize hands and change clothes whenever possible.