INSECTS: Phthiraptera spp.

Question 1

While host specific, lice will go develop as what following an egg, and prior to being an adult?

Answer 1

Nymph

Question 2

What suborder of lice is commonly called “biting lice” or “chewing lice,” which feed on the skin, hair, feathers, etc.? They are also rapidly moving.

Answer 2

Suborder Mallophaga or Ischnocera

Question 3

What is the common name for Trichodectes canis, and who is its host?

Answer 3

Dog biting louse, or canine chewing louse

Dogs

Question 4

What pathogenesis is associated with Trichodectes canis?

Answer 4

Vector for transmission (D. caninum), while also heavy infections can result in unkept/ neglected animals (especially the young)

Question 5

What clinical signs are associated with Trichodectes canis infestations?

Answer 5

Pruritis, alopecia, restlessness

Question 6

While MCL can be used, what else can be done to prevent canine chewing lice infestations?

Answer 6

Avoid contact with brushes, combs, blankets, etc.

Question 7

What is the common name for Feliocola subrostratus, and who is its host, as well as where will it be found at on the host?

Answer 7

Cat biting louse

Cats

Skin, face, pinna, back

Question 8

What morphology is associated with Feliocola subrostratus?

Answer 8

A triangular anterior portion of the head

Question 9

Felicola subrostratus is associated with infecting cats with what disposition?

Answer 9

Elderly, chronically ill, or longhaired

Question 10

What is the common name of Damalinia bovis? Who’s its host, and where can they be found?

Answer 10

Cattle biting louse

Cattle

Head, poll, neck, shoulders, rump, tail switch

Question 11

What season is associated with Damalinia bovis infestations?

Answer 11

Winter, due to excess hair, indoor housing, and parthenogenesis

Question 12

Why are Damalinia bovis infestations lower in the summer?

Answer 12

Skin surface temperatures are higher, and the sunlight is lethal to this louse

Question 13

What pathogenesis is associated with Damalinia bovis infestations?

Answer 13

Chronic dermatitis, intensive irritation, pruritis, and signs of malnutrition

Question 14

What is the common name for Damalinia ovis? Who is its host, and where can it be found on them?

Answer 14

Sheep biting louse
Sheep and goats

Wool over the whole body

Question 15

While the _______ pathogenic of all sheep lice, Damalinia _____, is highly active, and serves as an attractant for _____ flies.

Answer 15

Most

Damalinia ovis

Blow

Question 16

What is the common name for Damalinia caprae? Who is their host?

Answer 16

Goat biting louse

Goats

Question 17

What is the common name for Damalinia equi? Who are its hosts?

Answer 17

Horse biting louse

Horses

Question 18

Ichnocera, a chewing/ biting louse, has what common name? Who are its host?

Answer 18

Biting lice, or chewing lice (avian lice)

Domestic and wild fowl

Question 19

What pathogenesis is associated with avian lice?

Answer 19

Restlessness, inappetence, pruritis, feather plucking, and secondary infections

Question 20

Ischnocera, or avian lice, will consume -?

Answer 20

Keratin, and bite feathers