Parasitology

Question 1

Protozoa

Answer 1

Single-celled, microscopic organisms
* coccidians and Giardia

Question 2

Helminths

Answer 2

Multicelled organisms visible to the naked eye
* intestinal worms

Question 3

Direct Smear

Answer 3

• Detects protozoa in feces
• Quick estimate of parasite numbers

Question 4

Centrifugal Flotation

Answer 4

• Concentrates ova in feces
• Detects Giardia oocysts and Trichuris ova better

Question 5

Baermann Technique

Answer 5

Removes lungworm larvae fro small amounts of feces

Question 6

Modified Knott’s Technique

Answer 6

Performed to evaluate for blood parasites
* uses 1 mL of blood mixed with 9 mL of formalin
* centrifuge and dump off supernatant
* stain sediment and make slide
* look for microfliaria

Question 7

Definitive Hose

Answer 7

Parasite sexually reproduces and reaches adulthood

Question 8

Intermediate Host

Answer 8

Parasite’s immature stage grows and develops
* not sexually mature

Question 9

Paratenic Host

Answer 9

Parasite uses host to travel to another host
* may become embedded in tissue
* also called transport host

Question 10

Reservoir Host

Answer 10

Host that can infect others
* also called asymptomatic hosts
* show no clinical signs

Question 11

Answer 11

Roundworm
* found in small intestines
* Toxocara zoonotic - visceral larva migrans

Question 12

Roundworm
by Species

Answer 12

• Dog and Cat: Toxocara spp.
• Horse: Parascaris equorum

Question 13

Answer 13

Hookworm
* found in small intestines
* can also be in abomasum or large intestines of ruminants
* dog and cat zoonotic - cutaneous larva migrans

Question 14

Hookworm
by Species

Answer 14

• Dog: Uncinaria spp.
• Dog and Cat: Anclyostoma spp
• Ruminants: Trichostrongyles

Question 15

Answer 15

Whipworm
* Trichuris spp.
* found in large intestines

Question 16

Answer 16

Toxoplasma gondii
* infects cats
* found in small intestines
* zoonotic

Question 17

Answer 17

Dipylidium caninum

Question 18

Answer 18

Taenia spp

Question 19

Tapeworms

Answer 19

• Found in small intestines
• Diagnose via float or by seeing proglottids
• Dipylidium caninum and Taenia spp common

Question 20

Answer 20

Cystoisospora spp.
* coccidia
* infects dogs and cats
* found in small intestines

Question 21

Answer 21

Strongylus spp
* large strongyles
* infects horses
* found in large intestines

Question 22

Large Strongyles

Answer 22

• Strongylus vulgaris
• S. edentatus
• S. equinus

Question 23

Answer 23

Oxyuris equi
* horse pinworm
* found in large intestines
* diagnose via tape prep

Question 24

Answer 24

Strongyloides westeri
* horse threadworm
* found in small intestines

Question 25

Ectoparasite

Answer 25

Sucking Lice
* Anoplura spp.

Question 26

Ectoparasite

Answer 26

Biting Lice
* mallophaga spp.

Question 27

Dog and Cat

Answer 27

Ctenocephalides spp.
* dog and cat flea

Question 28

Answer 28

American Dog Tick
(Dermacentor spp)
* Rocky Mountain Spotted Fever
* tularemia
* Q fever

Question 29

Answer 29

Deer Tick
(Ixodes scapularis)
* lyme disease - Borrelia burgdorferi

Question 30

Answer 30

Brown Dog Tick
(Rhipicephalus sanguineus)
* Babesia canis
* Ehrlichia canis

Question 31

Answer 31

Sarcoptes Mite
* all stages done on host
* transmits via direct contact
* itchy

Question 32

Answer 32

Demodex Mite
* adults live in hair follicles
* eggs and larvae live at mouth of follicles

Question 33

Answer 33

Cheyletiella Mite
(walking dandruff)
* all stages on host
* generally not itchy

Question 34

Answer 34

Otodectes cynotis
* ear mites of cats and dogs

Question 35

Answer 35

Notoedres cati
* feline scabies
* transmits via direct contact with infected host
* itching with hair loss
* crusty lesions on face and ears