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About Us

Pathogenes is a small research laboratory with large ideas, located in Fairfield, Florida.  We test samples, analyze data, and invent tools to diagnose and treat horses with neurodegenerative diseases including EPM, equine protozoal myeloencephalitis.  You can read about our work, Learn More, or call us at 352-591-3221 and speak to any member of our team. We have Zoom meetings that can be scheduled upon request, discuss your case or new research that can help you with your case.


  • Siobhan P. Ellison, DVM PhD
  • Julie Osborne
  • Laura Benedetti DVM
  • Kenny Osborne
  • Jim Marshall, Pharmacist
  • Debbie Stuart
  • Bill Killeen
  • Valerie Frederick
  • Lila (the dog)

If you call during the week, 9 AM to 4 PM, we will gladly answer your questions and send you copies of our published, peer reviewed papers. Dr. Ellison is available for consulting anytime.  Call with your accession (case) number to facilitate information. She's more than happy to discuss cutting edge research. We can also set up Zoom meetings.

Julie is in daily and Kenny is in on Saturday's, 10 AM to 4 PM.  They can answer questions and get those results out to you quickly.

Dr. Laura Benedetti is our Clinical Trial specialist.  She serves as the liaison for veterinarians and she will help enter horses into the appropriate clinical study.

Jim Marshall is our clinical pharmacist. Jim, a Fort Lauderdale native and current Ocala resident with his wife, Carla, operated his own retail pharmacy in Marion county for several years before his recent retirement. He is an avid University of Florida sports fan, which keeps peace in the family, but shows no inclination towards yoga. Hopefully, this unfortunate fact will change after due exposure to the lab crew.

Debbie and Bill keep things in order.  You may occasionally speak to them. They are trained to take your phone number and give you some information. Valerie is our QA go-to person and maintains the website.


Lila, the lab dog, accepts cookies from our FedEx driver (delivery at 12 PM), UPS delivery man (delivery at 5 PM), and USPS mail woman (delivery at 3 PM).  She'd prefer you use these delivery systems for your samples, they all insist on giving her a cookie!  We pick up the PO deliveries at 9 AM, these samples are set up when they come in, giving you same day service.

And of course, there's our resident PHD, Siobhan Ellison. You can find out all about her at