Parasitology Lab Manual Flashcards
Organisms in the phylum Nematoda are commonly called __________.
roundworms
The development stages in the life cycle of a nematode are _______, _______, and ________.
egg, four juvenile stages (J1, J2, J3, J4), and adult
A life cycle is considered _________ if no intermediate host is necessary for development to the infective stage.
direct
The primary ascarids that infect puppies and kittens are ______, ______, and _______.
toxocara canis, toxocara cati, and toxocara leonina
Adult Dirofilaria immitis are found within the _______, _______, and ________.
right ventricle, pulmonary artery, and the fine branches of the pulmonary artery
The prepatent period of D. immitis in dogs is approximately ________.
6 months
The ______ is the intermediate host for D. immitis.
mosquito
The microfilariae of _______nonpathogenic nematodes must be differentiated from those of D. immitis.
human filarial from
Tapeworms are dorsoventrally flattened and contain segments known as ________.
proglottids
A dog and cat becomes infected with the tapeworm _______ by ingesting the flea intermediate host.
Dipylidium caninum
The intermediate hosts for Taenia pisiformis are _______ and _______.
rabbits and hares
The tapeworm _______ ________ is the hydatid cyst tapeworm for dogs.
Echinococcus granulosus
Nanophyetus salmincola is commonly referred to as the ______ of dogs.
salmon poisoning fluke
The three primary phyla of parasitic protozoa are ______, _________, and _______.
apicomplexa, sarcomastigophora, and ciliphora
The term _______ refers to the motile, feeding stage of a protozoal parasite.
trophozoite
_______ is a protozoal parasite described as pear shaped and dorsoventrally flattened with four pairs of flagella.
Giardia
Infection with _________ manifests as infertility, spontaneous abortion, and pyometra.
Tritrichomonas foetus
Cats infected with _________ generally only shed oocysts for less than 2 weeks for their entire life.
Toxoplasma gondii
_____ are basophilic, pear-shaped trophozoites found in the red blood cells (RBCs) on stained blood smears.
Babesia
The _______ are a group of obligate intracellular gram-negative bacteria and transmitted by arthropod or helminth vectors.
Rickettsia
_______ can act as intermediate hosts for the common tapeworm, Dipylidium caninum.
Fleas and lice
The biting and chewing lice are in the order ______, and the sucking lice are in the order ________.
Mallophaga and Anoplura
Infestation by larval dipterans is referred to as _____.
myiasis
Immunodeficiency of the host is necessary for infestation with ______ mites to be clinically apparent.
demodex
_______ is a species of mite that lives in the external ear canal of dogs and cats.
Psoroptidae
An organism which supports the adult or sexually reproductive form of a parasite.
Definitive host
The time interval between the initial infection with a parasite and the detection of the parasite in the host’s body.
Prepatent period
Organism that a parasite uses to temporarily reside in while it develops into an adult, and to bridge gaps in its life cycle.
Transport hosts (rodents, fish, reptiles, and insects)
Paratenic host
A parasitic infection caused by lice, small insects that feed on human blood.
Pediculosis
Infestation with or disease caused by mites.
Acariasis
Describe the method used to recover the ova of Oxyuris.
To collect samples from the perianal area using a clear adhesive tape and examine it under a microscope.
List the larval stages of trematodes.
Miracidium, sporocyst, redia, and cercaria
List conditions under which a protozoal parasite might develop into a cyst.
Adverse environmental conditions such as nutrient deprivation, temperature extremes, pH changes, desiccation, host immune response, changes in osmotic pressure, and the presence of specific chemical signals.
Ancylostoma caninum
hookworm
Dirofilaria immitis
heartworm
Toxocara canis
roundworm/ascarid
Trichuris vulpis (canine)
whipworm
Ancylostoma braziliense / tubaeforme (feline)
hookworm
Toxascaris leonina and toxocara cati
roundworm
Trichuris serrata (feline)
whipworm
Oxyuris equi
pinworm
Parascaris equorum
roundworm
Strongyloides westeri (equine)
intestinal threadworm
Life cycle stage of trematodes that develops in the intermediate host
Cercaria
Organism commonly referred to as a fluke
Trematoda
Common name for the larva of some species of flies; often in fistulated subcutaneous sites
Warbles
A parasite that resides within a host’s tissues
Endoparasite
A parasite that resides on the surface of its host
Ectoparasite
Infestation with larvae (maggots) of dipterans
Myiasis
The “head” of a cestode by which it attaches to its host
Scolex
Condition in which female organisms produce eggs that develop without fertilization
Parthenogenetic
Outer layer or covering of epithelium
Cuticle
Segments that comprise the body of a cestode
Proglottis
Any of the nematodes of the Ascaridoidea family
Ascaris
