About Us

The Worm-Ex Lab exists to assist the owner and their regular veterinarian to cost effectively implement modern evidence based preventative veterinary medical guidelines to enhance equine (and livestock and wildlife) health.


The Lab was founded on the passion and wide experience of Dr Karl van Laeren and his veterinary practice partner, Dr Jane Howes, and the widely recognized Danish veterinary deworming system.

This Danish system passed into law in Denmark in 1999, and subsequently in Netherlands in 2007, Finland in 2008 and Sweden in 2009, limits the prescription, dispensing and sale of deworming medication only in the event that evidence of excessive parasite burden exists.


The team at Worm-Ex Lab is cognizant of the need to balance the risk of certain types of colic associated with worm infestation and the reward of limiting the development of multi-drug resistant worms as a result of the over use of broad spectrum deworming medication.


To this end the practice of Drs van Laeren and Howes have 20 years of veterinary experience in parasitological consultation, diagnosis and management having examined more than 32000 dung samples of horses, farm animals and wild life.


As a result, the Worm-Ex lab is well positioned to assist the Southern African equine community to adopt and implement this gold standard in Veterinary worm management.

Dr. Karl van Laeren (BVSc) 
Karl Profile.jpg
  • Qualified at Onderspoort in with BVSc in 1980

  • Specialising as a Veterinary Surgeon, in Borrowdale, Harare,  Zimbabwe. for last 40 years

  • Been practicing parasitological diagnosis and consultations for over   20 years

  • Project - parasitological examinations on wildlife and looking at the incidence of parasites in wildlife orphanages including elephants and pangolins

  • Project - prevalence of parasites in wild zebra between the Serengeti, Zimbabwe and Botswana to compare with domesticated horses.

Dr Jane Howes (nee Schoeman) (BVSc) (MRCVS)
  • Qualified at Onderstepoort, Faculty of Veterinary Science 2011

  • Joined Dr Karl van Laeren as an Equine Veterinarian at Borrowdale Park Veterinary Hospital in 2012

  • Attended conferences and workshops held by the AAEP (American Association of Equine Practitioners) in Louisville, SAEVA (SA Equine Veterinary Association) conferences in South Africa, and BEVA (British Equine Veterinary Association) in Birmingham, UK

  • Registered with SAEVA and is a member of MRCVS

  • Jane is an accomplished Polocrosse player and has represented Zimbabwe in 2013 and 2018

Nora-Jean (NJ) Freeman
  • Been working in the Equine industry for the past 16 years including the South African National Equestrian Federation and the Gauteng Horse Society

  • Spent 4 years working with Equine Health Fund, where she gained  knowledge in the challenges facing SA with African Horse Sickness

  • Spent two years assisting Vetlink with veterinary congresses

  • Joined the Worm-Ex Lab team in 2019 to continue serving the equine industry

  • NJ is also a keen horse rider and enjoys dressage.