Ectoparasite Review Questions Flashcards
Are fleas host specific?
No, they have a predisposition, but will take any they can get.
What is FAD?
Flea Allergy Dermatitis
-allergy to saliva of flea, some animals are hypersensitive.
Which flea species is most common in dogs and cats?
Ctenocephalides felis
-85% to 90%
What is another way of dx’ing fleas if there are no fleas present on an animal?
The presence of “flea dirt”. This can be distinguished by moistening a cotton ball with water, and placing sample on the cotton ball. If debris turns red, it is flea dirt.
Name two commercial topical flea treatments.
- Advantage (Imidacloprid)
- K9 Advantix (Imidacloprid + Permethrin)
What are the two important groups of lice? Which are sucking, and which are biting?
- Anoplura - Sucking
2. Mallophaga - Biting / Chewing
Name the three species of lice which we discussed and give which group they belong to.
Anoplura
- Haematopinus spp.
- Linognathus setosus
- Polyplax spp.
Mallophaga
- Felicola subrostratus
- Trichodectes canis
Where are the egg/nits of lice found?
Attached to the hair/feathers on the head, base of ears, and elbow areas. They like dark furred areas.
Name two treatments for lice.
- Ivermectin
2. Permethrins
Are all mites pathogenic? If not, why?
No, not all mites are pathogenic. Some of them are normal fauna of mammals.
-Demodex is only a prob if immune suppressed.
Cheyletiella spp.
Walking Dandruff
Sarcoptes
Scabies
Notoedres
Cat Scabies
Demodex
Red Mange or Follicular Mange
Otodectes
Ear Mites
Which mite is found by using the cellophane tape method?
Cheyletiella spp.
Which mite causes very severe pruritus and can be recovered by skin scrape, but this method is not always successful at finding the mite?
Sarcoptes scabiei
Which mite parasitizes the external ear canal and causes a crusty, thick, black debris?
Otodectes cynotis
What are two main tick groups, and which one has a scutum?
- Argasidae
2. Ixodidae - has a scutum
Which tick transmits Lyme disease?
Ixodes scapularis
What is the organism that causes Lyme disease?
Borrelia burgdorferi
How are tick-borne illnesses dx’ed?
ELISA, serological tests.
What are some general signs of tick-borne illnesses?
Fever, lethargy, anorexia.
What is the organism that causes Rocky Mt. Spotted Fever?
Rickettsia rickettsii
Which fly species is an aggressive blood feeder?
Tabanus spp.
-Horsefly & Deerfly
Name two species of fly in which the larval stage is found in the stomach.
Hypoderma spp. - cattle bot fly
Gasterophilus spp. - bot fly (stomach bot of horses)
Where is Oestrus ovis larvae usually found?
In the sinuses of sheep.
Where is the larval stage of Cuterebra spp. found?
Below the skin (subcutaneous).
- around neck, face, chest of dogs, cats, rabbits, squirrels, mice.
- or in stomach.
What is the treatment method for Cuterebra spp.?
Very careful extraction of the larvae. Damaging it will release toxins, and may cause the animal to go into anaphylaxis. Once extracted, the would is treated with antimicrobials.
