Ectoparasites

Question 1

Insects have how many insects?

Answer 1

6

Question 2

Arachnids have how many legs?

Answer 2

8 legs

Question 3

What are two kinds of lice (pediculosis)?

Answer 3

Mallophaga

Anoplura

Question 4

Mallophaga (biting/chewing)

Answer 4

Trichodectes canis

Question 5

Anoplura (sucking lice)

Answer 5

Linognathus setosus (sucking louse)

Question 6

Trichodectes canis (biting louse)

Answer 6

Found as felicola sustratus in the cat
Cause rough hair coat, itching, and dermatitis
May act as intermediate host to dipylidium caninum (flea tapeworm)

Question 7

Linognathus setosus (sucking louse)

Answer 7

Causes skin itching, dermatitis, alopecia (hair loss), anemia (lack of blood), roughened hair coat
Usually transmitted by direct contact but all life stages may be transmitted by fomites
Are species specific

Question 8

Fomites

Answer 8

Object or thing to transport viruses or parasites to one animal to another

Question 9

Ctenocephalides felis (flea)

Answer 9

Infest dogs and cats
Intermediate host for dipylidium caninum, tularemia, plague etc.
Die at temp. below 20F for 48hrs or at temp above 120F for several days
Over 2000 species of fleas worldwide
Severe infestations can cause anemia

Question 10

Flea life cycle

Answer 10

Eggs laid at rate of up to 1 per hr
After about 2 days, larvae hatch and feed on any organic material for 5-15 days
Before becoming adults, larvae spin a cocoon and develop into an adult flea. Adult will remain in pupa until they sense vibration or increase in co2 causing them to emerge and find their host.

Question 11

Flea dirt

Answer 11

Adult flea feces

Question 12

Cuterebra (rodent bit fly larva)

Answer 12

Infests rodents, companion animals. and occasionally humans (myiasis)
Larval stage that infests skin
Acts as an irritant
Migration may be fetal
Have a cutaneous lump with a breathing hole
Use care when extracting as crushing larva may result in anaphylaxis.

Question 13

Cuter E. Bra

Answer 13

Baby bot fly

Question 14

Arachnids (acarasis)

Answer 14

Sarcoptes scabiei (scabies)
Demodex canis (démodectic mange mite)
Otodectes cynotis (ear mite)
Cheyletiella (walking dander mite)
Rhipicephalus sanguineus (brown dog tick)
Dermacentor variabilis (American dog tick)
Amblyomma americanum (lone star tick)
Ixodes scapularis (deer tick or black legged tick)

Question 15

Sarcoptes scabiei (scabies)

Answer 15

Found as notoedres cati In cats
Cause intense itching, dry, and thickened skin
Is contagious to humans and other pets
Mites burrow under the skin so may be difficult to diagnose
Diagnose through a skin scrape

Question 16

Localized

Answer 16

Small area

Question 17

Generalized

Answer 17

All over

Question 18

Demodex canis (demodectic mange)

Answer 18

Rare in cats
Causes areas of alopecia on head, neck and forelimbs
Can be localized or generalized
Diagnosed with skin scrape (may also pluck hair from root)
Is not contagious/zoonotic
Small numbers considered normal on skin flora

Question 19

Otodectes cynotis (ear mites)

Answer 19

Intense itching of the ear canal
Can be found on any area of the body
Not very common in dogs
Feed on epidermal debris and re easily transmitted