|
Glossary | Links | Lab Manual PDF |
|---|
Case Study 3: Arachnids in Small Animals
Itchy-Eared Rufus
Rufus is an adult mix-breed dog that has been exhibiting intermittent symptoms of otitis. He frequently shakes his head and paws at his ears. On examining Rufus, you detect a significant amount of a flakey brown material inside the pinna of each ear. Perceptive veterinarian that you are, you use a swab moistened with mineral oil to pick up the specimens seen at the case study station (see photo below) from Rufus' external ear canal and from the hair coat on the back of his head.
1. What is your diagnosis of the cause of Rufus' otitis?
Otodectes cyanotis - The ear mite of cats and dogs (Family Psoroptidae)
2. What is the most likely route through which Rufus acquired this infestation?
Direct contact with an infected dog (or cat).
3. Does the finding of specimens outside the ear contradict your diagnosis?
No: Otodectes cyanotis is normally found on the areas of the infested animal adjacent to the external ear canal.
4. What drugs are approved by the FDA for therapy in this case? (Give the chemical [generic] name of the active compounds.)
This site (http://dil.vetmed.vt.edu/NadaSecond/NADA.cfm) lists 3 approved drugs (in 4 formulations):
- Ivermectin (approved for ranch raised foxes and for cats and kittens)
- Selamectin (approved for dogs and cats for treatment and control)
- Milbemycin Oxime (approved for cats and kittens)
Other treatments such as rotenone, pyrethrins, etc, maybe licensed by the EPA or not listed with any government agency.
5. Is this parasite a threat to Fluffy (a cat) that shares the house with Rufus?
Yes, cats can have the same parasite. All dogs and cats in the same house (kennel) should be treated at the same time.
6. Is this parasite a threat to Rufus' owners?
