Gryffin |
But, Gryffin didn't get better. His wound still seemed to bother him, and we examined him again. The wound was free from infection - what could it be? Dr. Brooks commented that it was a remote possibility that it was a Cuterebra breathing pore, but no Cuterebra was found in the wound, and the pores do not scab over while the larvae are inside. It was also an unusual site for a Cuterebra infection, since Cuterebra larvae generally infect the head and neck regions of cats. She decided to satisfy her curiosity non-invasively, by placing the ultrasound probe on Gryffin's leg. This is what she saw:
Ultrasound image of a cuterebra larva |
Cuterebra larva after removal |
Cuterebra. It doesn't sound too bad, and usually, they don't cause too much trouble, but Cuterebra larval infection can cause problems for cats.
The Cuterebra larvae are immature bot flies - a large bumblebee sized fly. The adult flies are harmless - in fact, they live for such a short time, they do not even have mouth parts for eating!
Adult Cuterebra |
Once in the body, the larva forms a small cyst under the skin - most commonly near the face and neck. These lumps are usually very easy to distinguish from a cancerous lump by the 2-4mm breathing pore that the larva creates. Often, the larva can be seen moving towards and away from the pore to breathe. These lumps are called "warbles". It is most common to see the warbles in late
August and September. Some years, we see a lot, other years, we see none. In the Waterford area, kittens tend to be most commonly affected, but any cat that goes outside could come into contact with a Cuterebra larva.
Sometimes, a sneezing cat may have a Cuterebra infection in its nose. On some rare occasions, a Cuterebra infection may occur in or near the eye or spinal cord. These situations are very rare. Cats that develop eye infections may or may not have damage to the eye. Neurologic signs of Cuterebra infection may include "head pressing", circling in one direction, or other behavioral changes. Cats that develop spinal cord infections may fully recover once the Cuterebra larva is removed.
The most effective treatment for Cuterebra infection (called "cuterebriasis") is surgical removal of the larva. In some situations, this can be quite complicated, depending on the location of the larva. It is important to be able to remove the entire larva, and not to break the larva while it is inside the cat, or a severe allergic-type reaction can occur (called "anaphylaxis").
It is important to remember that you can NOT get a Cuterebra infection from an infected cat, but you may have Cuterebra present in your yard.
Two weeks after removing Gryffin's parasite, he looks great! |
These days, Gryffin is doing much better, without his creepy-crawly passenger!
EDIT: 11/4/14 Gryffin came in for a recheck and had gained almost a pound since his last visit. His wound is healed and he is looking and feeling great!
For more information:
Article on Cuterebra from the American Association of Veterinary Parasitologists
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