13/07/2022
HENDRA VIRUS
An unvaccinated 21 year old Arab-cross horse in Mackay has tested positive for the Hendra virus and has been euthanased. Owners noted on the 6.7.22 that the horse, which was in good condition, was “off it’s feed” and had difficulty chewing, but did not call the vet. The vet was called the next day when the horse was severely ataxic.
The horse presented on the 7.7.22 with neurological signs (staggering and disoriented) and a swollen muzzle, but other vital signs including temperature, heart rate and gut sounds were within normal ranges. The vet especially noted the absence of respiratory signs.
The horse was euthanased immediately and samples were taken. PCR testing was positive for the blood sample however nasal swabs were negative.
This is a timely reminder that all horses should be vaccinated against this deadly disease in order to protect vets, owners and the horses, and further note the following:
• We urge all vets to be cautious when examining any unwell, unvaccinated horses – as the clinical signs for Hendra virus are often very vague and can be similar to many other common diseases.
• Weather patterns that we have seen over the past year have been similar to those seen prior to the 2011 outbreak which saw more than 20 horses contract the virus in the span of a few months.
