Parasit: Exam 1

Question 1

In parasitism, the parasite becomes ___________________ the host

Answer 1

metabolically dependent on

Question 2

Parasitism by an endoparasite to an __________________ w/in the host.

Answer 2

infection

Question 3

Parasitism by an ectoparasite leads to an __________ on the host.

Answer 3

infestation

Question 4

Which of the parasiticides would be used to treat an animal that harbors nematodes?

Answer 4

Anthelmintics

Question 5

If a human becomes infected with the larval stages of Dirofilaria immitis, the parasite is called a/an ____________ parasite.

Answer 5

incidential

Question 6

Air bubbles appearing on a fecal flotation slide that often are mistakenly identified as parasite eggs are an example of a/an _______.

Answer 6

pseudoparasite

Question 7

The mosquito is the __________ host for Dirofilaria immitis, whereas the dog is the ______________ host.

Answer 7

Intermediate; definitive

Question 8

Which of the following best describes the host that harbors the larval, junevile, immature, or asexual stages of the parasite.

Answer 8

intermediate host

Question 9

These organisms are not members of the kingdom of Animalia.

Answer 9

protozoans

Question 10

The phylum _______________ consists of the roundworms.

Answer 10

Nematoda

Question 11

Mites and ticks are members of the phylum:

Answer 11

Arthropoda

Question 12

This statement about parasites is the least accurate.

Answer 12

The majority of protozoans are parasitic.

Question 13

This statement about arthropods is least accurate.

Answer 13

They serve as definitive hosts for helminths and protozoans.

Question 14

The phylum Arthropoda includes most of the _________ seen in vet medicine.

Answer 14

ectoparasites

Question 15

Regarding nematodes:

Answer 15

They are diagnosed most often on fecal flotation.

Question 16

Female nematodes that retain their eggs w/in their uterus and incubate them, and then give birth to live larvae are:

Answer 16

Larviparous

Question 17

Female nematodes that produce eggs containing a 1st-stage larva w/in the eggshell are:

Answer 17

Ovoviviparous

Question 18

Female nematodes that produce eggs containing either a single-cell stage or a morula stage w/in the eggshell are:

Answer 18

Oviparous

Question 19

Which larval stage in the life cycle of most nematodes is infective for the definitive host?

Answer 19

3rd

Question 20

This statement about the life cycle of nematodes is most accurate:

Answer 20

The first 3 larval stages can develop either in the external environment or w/in an intermediate host, depending on the nematode in question.

Question 21

Feale worms capable of producing viable ova w/o fertilization from a male worm are called

Answer 21

parthenogenic

Question 22

An embryonated egg is:

Answer 22

larvated

Question 23

What nematode of dogs and cats is not zoonotic?

Answer 23

Trichuris vulpis

Question 24

This nematode ova has polar plugs at both ends.

Answer 24

Trichuris vulpis

Question 25

This statement about Oxyuris equi is least accurate.

Answer 25

The ova are readily detectable on fecal floatation.

Question 26

___________ is the ascarid of dogs.

Answer 26

Toxocara canis

Question 27

This nematode of the ruminants requires an intermediate host.

Answer 27

Thelazia rhodesii

Question 28

Correct spelling of the pinworm of gerbils.

Answer 28

Dentostomella translicida

Question 29

Regarding Toxocara canis:

Answer 29

the larvae can cross the placental barrier.

Question 30

The mosquito is the intermediate host for which this nematode of horses.

Answer 30

Setaria equina

Question 31

Describe hookworm eggs:

Answer 31

oval or ellipsoidal, thick-walled, and containing an 8-16 cell morula when passed in feces.

Question 32

Describe whipworm eggs:

Answer 32

Thick-walled and yellow-brown in color, w/ a symmetric shell and prominent polar plugs at both ends.

Question 33

This statement about ruminant trichostrongyles is the least accurate.

Answer 33

Trichostongyles are the least common nematodes diagnosed on fecal flotation in ruminants.

Question 34

_____________ is the most common clinical sign encountered in swine infected with the nematode Metastrongylus elongatus.

Answer 34

coughing

Question 35

This statement about Ascaridia sp of nematodes that infect birds is the least accurate.

Answer 35

Their eggs are modulated when passed, similar to the Ancylostoma species of dogs and cats.

Question 36

This statement about Trichuris vulpis is the most accurate.

Answer 36

Trichuris vulpis eggs are unembryonated when passed in feces.

Question 37

__________ is a zoonotic condition caused when infective eggs of Baylisascaris procyonis are ingested by an accidental host.

Answer 37

Neurologic larva migrans

Question 38

This statement about Habronema microstoma in horses is false.

Answer 38

it causes a skin condition known as winter sores.

Question 39

This canine nematode’s immature stage cannot be recovered from either a superficial or deep skin scraping.

Answer 39

Oslerus osleri

Question 40

This nematode doesn’t use a mosquito as an intermediate host.

Answer 40

The swine lungworm.

Question 41

This statement about Onchocerca cervicalis. the equine filarial parasite, is the least accuate.

Answer 41

It can be diagnosed by taking a skin scraping.

Question 42

This statement about Passalurus ambiguus, a nematode of rabbits, is most accurate.

Answer 42

Eggs passed in the feces are immediately infective.

Question 43

This statement about Parascaris equorum, a nematode in horses, is most accurate.

Answer 43

It can grow to a length of 50cm.

Question 44

Adults of the canine heartworm, Dirofilaria immitis, are found in the:

Answer 44

right ventricle of the heart and pulmonary arteries.

Question 45

The prepatent peropd of Dicrofilaria immitis in dogs is:

Answer 45

6 mo

Question 46

Dicrofilaria immitis cannot be diagnosed by this method.

Answer 46

fecal floatation

Question 47

The clinical signs of canine heartworm doesn’t include:

Answer 47

bloody, tarry stool

Question 48

This statement of infection of felines w/ Dirofilaria immitis is the most accurate.

Answer 48

There are no approved treatments for feline heartworm disease.

Question 49

This statement about pinworms in mice is false.

Answer 49

Pinworm eggs are highly sensitive to environmental changes.

Question 50

This statement of the Trichinella spiralis is the most accurate.

Answer 50

Diagnosis of the larval stage in pigs can be accomplished only by a biopsy of muscle tissue.