Ask A Vet: Dogs with Bloat are a Serious Emergency
Ask A Vet: Pinkeye is Contagious, Causes Pain
Sunday, September 2, 2012
Dear Dr. Weldy’s,
I have several Angus heifers that have red eyes and are squinting a lot. My neighbor thought it looked like pinkeye. What can I do to treat and prevent this disease?
Dear Reader,
Pinkeye, also known as Infectious Bovine Keratoconjunctivitis, is a very common disease of the eyes of cattle. It is most commonly caused by the bacteria Morexella bovis, but other bacteria may contribute to this problem. The Morexella bovis bacteria is transmitted from the face of an infected animal to another by face flies and tall grasses. Another factor that contributes to the spread of the bacteria is ultraviolet light (sunlight). The eye becomes irritated by sunlight and tall grasses, and the bacteria brought by those pesky flies can easily penetrate the cornea (surface of the eyeball).
Pinkeye is most common in cattle 4-24 months old and most cases occur in summer and early fall. Initially, signs include red and irritated eyes with increased tearing. Within 1-3 days, owners may notice more squinting, blinking frequently, swollen eyelids, white discharge from the eyes, white corneas (instead of clear), corneal ulcers and even blindness. One or both eyes may be affected.
This is a very painful condition and owners will likely notice decreased eating and weight loss. Treatment of pinkeye includes antibiotics against Morexella bovis such as tetracyclines injections. Topical ointments can be used on the ulcers as well, but use caution when purchasing products over the counter such as powders and sprays.
These may cause more pain and irritation. Consult with your veterinarian about proper treatment of your cattle. They may recommend certain surgical procedures to hasten recovery and lessen pain. It is also important to isolate infected cattle to prevent the spread of this disease. Prevention of pinkeye includes several management techniques to avoid the spread of the bacteria. To control the fly population, owners can use pour-on insecticides, powders and even insecticide ear tags. Also, mowing fields of tall grasses and weeds will help control the spread of disease. If possible, provide shelter from sunlight.
Several vaccines are available against pinkeye. They may not completely eliminate this disease on your farm, but they will likely decrease the severity of the disease. It is important to vaccinate at least two month before the onset of “fly season” to ensure efficacy. And be sure to follow the labeled instructions for the vaccine. Once an animal has recovered from pinkeye, they will likely have immunity against the disease for next year.
As always, consult your veterinarian for the best treatment and prevention strategies for your farm.
-Dr. Jolene Birney
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