Equine Parasitology

Question 1

What is the most common parasite seen in foals and weanlings?

Answer 1

Ascarids (Parascaris)

Question 2

What is a major species of large Strongyles?

Answer 2

Strongylus vulgaris

Question 3

Where do Strongylus vulgaris larvae live?

Answer 3

cranial mesenteric artery and it branches

Question 4

What can Strongylus vulgaris larvae cause?

Answer 4

may cause parasitic thrombosis and arteritis. blockage intestinal circulation = death

Question 5

What are some treatments for Strongyles?

Answer 5

Ivermectin, Moxidectin, Fenbendazole

Question 6

Most adult horses have developed an immunity to ___________.

Answer 6

reinfection

Question 7

When is a horse with parasites treated?

Answer 7

when egg counts is >100-200 eggs per gram of feces

Question 8

What is Gastrophilus sp.?

Answer 8

bot fly of the horse

Question 9

What is the life cycle of Gastrophilus sp.?

Answer 9

adult fly lays eggs on horse, horse licks and ingests larvae, larvae migrate through oral cavity and end up in stomach

Question 10

What are some treatments for Gastrophilus sp.?

Answer 10

Ivermectin, Moxidectin

Question 11

What is Strongyloides westeri?

Answer 11

threadworm of the horse

Question 12

Threadworm is mainly seen in _______.

Answer 12

foals

Question 13

What are some treatments for Strongyloides westeri?

Answer 13

Ivermectin, Oxibendazole

Question 14

What is Oxyuris equi?

Answer 14

pinworm

Question 15

How is Oxyuris equi diagnosed?

Answer 15

via clinical signs, cellophane tape may also be used

Question 16

What are some treatments for Oxyuris equi?

Answer 16

Moxidectin, Pyrantel

Question 17

What are Habronema muscae and Microstoma?

Answer 17

stomach worms

Question 18

How does a horse get infected with Habronema muscae or Microstoma?

Answer 18

eggs/larvae are ingested by larvae of horse/stable flies, which serve as intermediate host

Question 19

What causes “Summer Sores”?

Answer 19

migrating larvae

Question 20

What are some treatments for Habronema muscae and Microstoma?

Answer 20

Ivermectin and Moxidectin

Question 21

What are Parascaris equorum?

Answer 21

roundworm of the horse

Question 22

What can Parascaris equorum cause?

Answer 22

can cause colic in foals and migrating larvae can cause liver/lung damage

Question 23

What are some treatments for Parascaris equorum?

Answer 23

Pyrantel, Ivermectin, Moxidectin

Question 24

What are Anoplocephala magna, A perfoliata, and Paranoplocephala mamillana?

Answer 24

equine tapeworms

Question 25

What is the intermediate host for tapeworms?

Answer 25

pasture mites

Question 26

What is the treatment for tapeworms?

Answer 26

Praziquantel

Question 27

What are Eimeria leukarti?

Answer 27

coccidia of the horse

Question 28

What are Dictocaulus arnfield?

Answer 28

lungworm of the horse and donkey

Question 29

What is the “natural host” of Dictocaulus arnfield?

Answer 29

donkeys

Question 30

What can Dictocaulus arnfield cause in horses?

Answer 30

chronic bronchitis

Question 31

What are Sarocystis neurona?

Answer 31

protozoa that lives in the nervous system and causes EPM (Equine Protozoa Myeloencephalitis)

Question 32

How are Sarocystis neurona transmitted?

Answer 32

consumption of sporocytes in opossum feces

Question 33

What are the clinical signs of Sarocystis neurona?

Answer 33

neurological signs

Question 34

What is the treatment for Sarocystis neurona?

Answer 34

antiprotozoal drugs

Question 35

What are Bovicola spp.?

Answer 35

biting lice

Question 36

What are Hamatopinus asini?

Answer 36

sucking lice

Question 37

What are Microthoracius spp.?

Answer 37

sucking louse

Question 38

What are Sarcoptes scabiei, Psoroptes equi, Chorioptes bovis, and Demodex spp.?

Answer 38

mites

Question 39

What is Musca domestica?

Answer 39

house fly

Question 40

What is Musca autumnalis?

Answer 40

face fly

Question 41

What is Stomoxys calcitrans?

Answer 41

stable fly