Walking On Volume 6, Issue 4, April 2019 | Page 15
For the Health of It
in mind that not all these signs may be present. Horses
can be infected and still appear normal (subclinical
infection), especially if they have been previously vac-
cinated. Other infectious agents can produce clinical
signs that look like EI, but aren’t. EHV-1/4 or strangles
(Streptococ- cus equi) are examples. Have your veteri-
narian collect a nasal swab, or ideally a nasopharyngeal
swab (which goes beyond the nostrils into the back
of the throat), and send it to a veterinary diagnostic
laboratory to confirm a diagnosis. Information on na-
sal-swabbing can be found at http://vetsci.ca.uky.edu/
services. If your horse does develop clinical signs of EI,
then the rule of thumb is that for every day of fever, it
should be stall-rested for a week.
2. Vaccinate your horses using a vaccine that pro-
tects against both FC1 and FC2 viruses. Horses’ anti-
body responses to vaccination do not last indefinitely,
so if your horse has not been vaccinated for six months
or more, then it is due for a booster. If it has been three
months or less since the last booster, then hopefully
your horse’s immunity should be at its peak. Consult
your veterinarian and refer to the AAEP Guidelines
(https://aaep.org/guidelines/ vaccination-guidelines/
risk-based-vaccination- guidelines/equine-influenza).
In the event of an EI outbreak, where your horse may
potentially be exposed, vaccination in the immediate
face of the event might help if there is sufficient time—
at least a week—for the horse’s immune system to start
making antibodies.
3. Communicate with your veterinarian and with
the manager or resident veterinarian at any facility to
which you are taking your horse. Is there an outbreak
situation? If so, re-evaluate your horse’s vaccination
status, and re-evaluate exposing your horse to flu.
4. Biosecurity from infectious diseases is best en-
forced by avoiding exposure whenever possible. For
farms, the best biosecurity is obtained by quarantining
newly arriving horses away from the general herd for
sufficient time to assure that the new arrivals are not
bringing diseases with them. EI is transmitted through
the air by coughing and indirectly on hands or cloth-
ing/ equipment (fomites) that have been in contact
with an infected horse.
CONTACT:
Thomas Chambers, PhD tmcham1@uky edu
(859) 218-1126
Maxwell H Gluck Equine Research Center Univer-
sity of Kentucky
Lexington, KY
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