Parasit: Exam 1 Flashcards
In parasitism, the parasite becomes ___________________ the host
metabolically dependent on
Parasitism by an endoparasite to an __________________ w/in the host.
infection
Parasitism by an ectoparasite leads to an __________ on the host.
infestation
Which of the parasiticides would be used to treat an animal that harbors nematodes?
Anthelmintics
If a human becomes infected with the larval stages of Dirofilaria immitis, the parasite is called a/an ____________ parasite.
incidential
Air bubbles appearing on a fecal flotation slide that often are mistakenly identified as parasite eggs are an example of a/an _______.
pseudoparasite
The mosquito is the __________ host for Dirofilaria immitis, whereas the dog is the ______________ host.
Intermediate; definitive
Which of the following best describes the host that harbors the larval, junevile, immature, or asexual stages of the parasite.
intermediate host
These organisms are not members of the kingdom of Animalia.
protozoans
The phylum _______________ consists of the roundworms.
Nematoda
Mites and ticks are members of the phylum:
Arthropoda
This statement about parasites is the least accurate.
The majority of protozoans are parasitic.
This statement about arthropods is least accurate.
They serve as definitive hosts for helminths and protozoans.
The phylum Arthropoda includes most of the _________ seen in vet medicine.
ectoparasites
Regarding nematodes:
They are diagnosed most often on fecal flotation.
Female nematodes that retain their eggs w/in their uterus and incubate them, and then give birth to live larvae are:
Larviparous
Female nematodes that produce eggs containing a 1st-stage larva w/in the eggshell are:
Ovoviviparous
Female nematodes that produce eggs containing either a single-cell stage or a morula stage w/in the eggshell are:
Oviparous
Which larval stage in the life cycle of most nematodes is infective for the definitive host?
3rd
This statement about the life cycle of nematodes is most accurate:
The first 3 larval stages can develop either in the external environment or w/in an intermediate host, depending on the nematode in question.
Feale worms capable of producing viable ova w/o fertilization from a male worm are called
parthenogenic
An embryonated egg is:
larvated
What nematode of dogs and cats is not zoonotic?
Trichuris vulpis
This nematode ova has polar plugs at both ends.
Trichuris vulpis
This statement about Oxyuris equi is least accurate.
The ova are readily detectable on fecal floatation.
___________ is the ascarid of dogs.
Toxocara canis
This nematode of the ruminants requires an intermediate host.
Thelazia rhodesii
Correct spelling of the pinworm of gerbils.
Dentostomella translicida
Regarding Toxocara canis:
the larvae can cross the placental barrier.
The mosquito is the intermediate host for which this nematode of horses.
Setaria equina
Describe hookworm eggs:
oval or ellipsoidal, thick-walled, and containing an 8-16 cell morula when passed in feces.
Describe whipworm eggs:
Thick-walled and yellow-brown in color, w/ a symmetric shell and prominent polar plugs at both ends.
This statement about ruminant trichostrongyles is the least accurate.
Trichostongyles are the least common nematodes diagnosed on fecal flotation in ruminants.
_____________ is the most common clinical sign encountered in swine infected with the nematode Metastrongylus elongatus.
coughing
This statement about Ascaridia sp of nematodes that infect birds is the least accurate.
Their eggs are modulated when passed, similar to the Ancylostoma species of dogs and cats.
This statement about Trichuris vulpis is the most accurate.
Trichuris vulpis eggs are unembryonated when passed in feces.
__________ is a zoonotic condition caused when infective eggs of Baylisascaris procyonis are ingested by an accidental host.
Neurologic larva migrans
This statement about Habronema microstoma in horses is false.
it causes a skin condition known as winter sores.
This canine nematode’s immature stage cannot be recovered from either a superficial or deep skin scraping.
Oslerus osleri
This nematode doesn’t use a mosquito as an intermediate host.
The swine lungworm.
This statement about Onchocerca cervicalis. the equine filarial parasite, is the least accuate.
It can be diagnosed by taking a skin scraping.
This statement about Passalurus ambiguus, a nematode of rabbits, is most accurate.
Eggs passed in the feces are immediately infective.
This statement about Parascaris equorum, a nematode in horses, is most accurate.
It can grow to a length of 50cm.
Adults of the canine heartworm, Dirofilaria immitis, are found in the:
right ventricle of the heart and pulmonary arteries.
The prepatent peropd of Dicrofilaria immitis in dogs is:
6 mo
Dicrofilaria immitis cannot be diagnosed by this method.
fecal floatation
The clinical signs of canine heartworm doesn’t include:
bloody, tarry stool
This statement of infection of felines w/ Dirofilaria immitis is the most accurate.
There are no approved treatments for feline heartworm disease.
This statement about pinworms in mice is false.
Pinworm eggs are highly sensitive to environmental changes.
This statement of the Trichinella spiralis is the most accurate.
Diagnosis of the larval stage in pigs can be accomplished only by a biopsy of muscle tissue.
