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Announcements & Disease Updates


  • Mycoplasma bovis outbreak in Pronghorn 
    • The WSVL received three pronghorn carcasses from the Wyoming Game and Fish Department (WGFD) in early March, following reports of multiple pronghorn mortalities in the Pinedale area. All three pronghorn had severe pneumonia caused by Mycoplasma bovis.  This bacterium has been associated with other high mortality outbreaks in pronghorn near Gillette in 2019 and 2020.  The estimated number of pronghorn mortalities at this time is 300, and the WGFD is working to remove carcasses so that other healthy animals are not exposed.  While Mycoplasma bovis causes fatal pneumonia in pronghorn and bison, it typically does not cause severe disease in cattle.  

      The WGFD has an online reporting tool for the public to utilize, if they see any additional sick pronghorn in other areas of the state.

      Report a Wildlife Disease
  • Cytology Update
    • WSVL will no longer be offering blood film review cytology. Starting January 30th, 2023, any cytology sample received for blood film review will be forwarded to CSU for testing. Respective samples will be shipped to CSU via ground UPS. Referral lab results are usually reported within 4 days. Each case submitted will cost $48.00 plus shipping costs. We hope the overall impact of this change to you is minimal, as our goal is to continue to provide quality diagnostic services to our clients. 
  • New LIMS System
    • WSVL will be experiencing some changes over the next several weeks while updating our LIMS software. Although we don’t expect for our clients to notice these changes, if there should be any difficulties in sending/receiving accessions, reports, billing, etc, please let us know as soon as possible. We appreciate your patience as we move forward. Thank you.
  • No Mail on Saturdays
    • WSVL will no longer be processing USPS mail on Saturday mornings. Currently, WSVL does not receive FedEx or UPS shipments on Saturdays.  Starting this week (October 22), any USPS parcels received on Saturday mornings will be stored refrigerated and processed the next business day (typically Monday). The WSVL sample drop box will be checked on Saturday mornings, and any samples will also be placed in refrigerated storage until Monday. Keeping this in mind, we would discourage collecting and sending time sensitive material (such as preputial washes for trichomonas testing, or urine for culture) on Fridays.  We hope the overall impact of this change to you is minimal, as our goal is to continue to provide quality diagnostic service to our clients. 
  • Plague and Tularemia FA Test:
    • The reagents for the Plague & Tularemia FA tests have been discontinued. Effective September 1st we will be switching to PCR for diagnosis. The price for Plague/Tularemia PCR will be $60. If a negative PCR result is obtained, we will follow-up with culture to rule out other bacterial infections.
  • Euthanasia Services:
    • Effective immediately the WSVL will no longer be able to provide euthanasia services for animals to be submitted for necropsy or disposal.  Animals will need to be dead on arrival at the lab.  Animals presented alive at the lab will not be accepted and will be referred to local veterinarians for euthanasia.  We apologize for any inconvenience this may cause you.
  • Attention – Coggins’ Sample Submitters:
    • Please consider utilizing serum separator tubes or manually separating serum prior to submission for Coggins' samples. Serum separated from the clot is much more durable in shipping than serum left on the clot. Temperature extremes, shipping delays, and road closures, are all common in WY during winter and summer. Every year, our serology laboratory must request new serum specimens when they get hemolyzed blood for EIA tests. Your clients, patients and staff will appreciate timely results when you don't have to replace hemolyzed specimens during adverse weather.

culture plate

What is an antibiogram?

The antibiogram is a summary of antimicrobial susceptibilities of bacterial isolates submitted to WSVL. We will provide annual antibiograms to assist our clients in determining antibiotic therapy prior to knowing the susceptibility information.

Disease Updates


herd of cattle

Brucellosis Updates in Park and Sublette Counties

A cattle herd in Park County was confirmed as “Brucellosis affected” following laboratory testing at the Wyoming State Veterinary Laboratory (WSVL), Laramie. Laboratory results were confirmed at the National Veterinary Services Laboratory (NVSL), in Ames, Iowa, December 6, 2022. One cow tested positive on blood tests at both laboratories. Further testing, including bacterial culture, will be conducted in addition to the serology tests already completed.


Brucellosis Suspect in Sublette County - November 2022

The Wyoming State Veterinarian has been notified by the Wyoming State Veterinary Laboratory (WSVL) that blood from one cow has suspect results to tests for Brucellosis. Additional testing was performed at the National Veterinary Services Laboratory (NVSL) in Ames, IA. The suspect cow is located in Sublette County.


Equine Strangles in Fremont County

WSVL confirmed a diagnosis of “equine strangles” by culturing Streptococcus equi ssp.equi in early October. The horse was associated with a college campus in Fremont County, and four additional horses associated with that college have also been diagnosed. According to the Wyoming Assistant State Field Veterinarian, the horses have a variety of clinical signs that may include fever, nasal discharge, swollen submandibular lymph nodes, and facial swelling. At this time, the outbreak is ongoing. Owners with horses that may have been exposed at this college campus are encouraged to quarantine and monitor their animals.


Avian Influenza Update Fall 2022

Wyoming is again documenting cases of highly pathogenic avian influenza (HPAI) in wildlife after a lull since early June. The Wyoming Game and Fish Department’s Wildlife Health Laboratory in cooperation with the Wyoming State Veterinary Lab (WSVL) has documented HPAI in eight wild birds since September 16th, 2022, including two turkey vultures from the University of Wyoming campus. This resurgence of HPAI is likely due to exposure from migratory birds. Peak of fall bird migration in Wyoming is late September through mid-November. Click the linked title to read more.

little brown bat

Bat Found in Child's Bed Tested Positive for Rabies

WSVL recently performed rabies testing on a bat that was found in a child’s bed. The bat tested positive for the rabies virus, which can spread to humans from a bite or scratch. The bats most commonly found in Wyoming are little brown bats, and are very small. The bats weigh less than one ounce when fully grown, so bites or scratches from these tiny bats often go unnoticed. If there is potential human contact with a bat, especially within your home or other building, it should be submitted for rabies testing. If you find a bat in your home, call the local animal control for information about safely capturing and packaging it for testing. You can also call the Wyoming State Veterinary Laboratory at 307-766-9925 for more information about submission and testing. For public health information such as exposure risk and need for post-exposure vaccination contact the Wyoming Department of Health, 307-777-5825. Due to the quick thinking of the child’s parents by saving the bat and submitting it for testing to WSVL, another rabies related death was prevented.

bacterial culture plate

Plague Found in Domestic Cat in Albany County

A domestic cat from Albany County, near Laramie, tested positive for plague at the Wyoming State Veterinary Lab. When cats and dogs have plague, they may have swollen lymph nodes, sleep more, not eat or drink, and have a fever. Plague is caused by a bacterium that CAN be transmitted to humans, so if you see your pet showing clinical signs; it is very important to get them to your veterinarian for immediate treatment. When humans have plague they have similar symptoms, including muscle aches and even pneumonia. Plague can be treated with antimicrobials, but when untreated it likely will result in death. If you see any wild rabbits or prairie dogs that are sick or dead, do not handle. You can contact the Wyoming Game and Fish for proper collection and testing of wildlife (307-745-5865), or the Wyoming State Veterinary Laboratory for questions regarding pets (307-766-9925).


Monkeypox Testing

The Wyoming Department of Health Laboratory is currently not conducting testing on human specimens for Monkeypox, but will accept and refer specimens to other public health laboratories if needed. They are working on bringing on testing at the lab, but prefer at this time that providers send samples to commercial laboratories when possible to avoid delays in results. The commercial labs known to be conducting testing on human specimens are Labcorp, Quest, ARUP, Mayo, Aegis, and Sonic Healthcare. CDC will accept animal specimens and they have information for Veterinarians here including how to submit specimens. Any veterinarians who suspect monkeypox in an animal Should contact the Wyoming Department of Health or the State Veterinarian so that they are aware and can collaborate on a response.


Avian Influenza Found in Wyoming Birds

Highly pathogenic avian influenza (HPAI) has been detected in several counties in Wyoming in both wild and domestic birds. HPAI is a highly contagious viral disease that can infect chickens, turkeys and other birds and can cause severe illness and/or sudden death in infected birds.

three horses

EHM in Park County reported to Wyoming State Veterinarian’s Office

A Park County horse was confirmed to be infected with Equine Herpesvirus (EHV-1) Myeloencephalopathy January 26, 2022. EHV-1 is the very common Rhinopneumonitis virus which typically causes mild respiratory symptoms in infected horses, but in rare cases may cause severe neurologic signs.

cottontail rabbit

Rabbit Hemorrhagic Disease (RDHV2) Updates and Information

Rabbit hemorrhagic disease (RHDV2) is a fatal disease of rabbits and is considered a foreign animal disease in the US. This is a non-zoonotic disease, affecting both wild and domestic rabbits. It is now considered "Stable endemic" in Wyoming. Testing rabbits is key to monitoring the disease spread.

Contact Us

Wyoming State Veterinary Laboratory

1174 Snowy Range Rd

Laramie, WY 82070

Phone: 307-766-9925

Toll Free: 1-800-442-8331

Fax: 307-721-2051


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