Multiple choice (Laventhal) Part II Flashcards
Malaria parasite with 6 to 12 merozoites in the schizonts
Plasmodium malariae
C- or U-shaped body with a large kinetoplast
Trypanosoma cruzi
Large kidney-shaped nucleus
Balantidium coli
Trophozoites ingests red blood cell
Entamoeba histolytica
Large glycogen vacuole
Iodamoeba butschlii
Schizonts not seen in peripheral blood
Cytoisospora belli, Toxoplasma gondii, Plasmodium falciparum
Pseudocysts in the brain
Toxoplasma gondii
Oocysts found in the human feces
Cytoisospora belli
Commonly causes relapses of malaria
Plasmodium vivax and Plasmodium ovale
Transmitted by tsetse fly
Trypanosoma brucei gambiense and Trypanosoma brucie rhodesiense
Pathogenic intestinal flagellates
Giardia lamblia
Material from a gum lesion is stained with trichrome, revealing amebae that have a single nucleus and contain partially digested neutrophils. The most likely identification is:
Entamoeba gingivalis
Concerning Toxoplasma gondii, all of the following are true EXCEPT;
a. Congenital infections can occur
b. Human infection occurs when oocysts are ingested
c. They are diagnosed by serology tests
d. Human infection occurs when sarcocysts are ingested in undercooked meat
e. Domestic cats are definitive hosts
D
Acanthamoeba keratitis is usually associated with:
Contaminated lens-cleaning solutions
Cryptosporidium spp. oocysts are best detected in fecal specimens using the
Modified Ziehl-Neelson acid-fast stain
The two parasitic organisms most commonly associated with waterborne outbreaks of diarrhea include:
Gardia lamblia and Cryptosporidium spp.
The malaria parasite characterized by the presence of multiple ring forms or “banana-shaped” gametocytes in red blood cells is:
Plasmodium falciparum
The characteristic that most clearly differentiated cysts of Iodameoba butschlii from other amebic cysts is:
A large glycogen vacuole
A blood parasite that invades reticulocytes, is characterized by a single ring forms and Schuffner’s dots, and may cause a true relapse is:
Plasmodium vivax
The protozoan causing diarrhea that has been associated with raspberries, strawberries, herbs and some vegetable is:
Cyclospora cayetanensis
Black water fever is caused by:
Plasmodium falciparum
Winterbottom’s sign is associated by:
Trypanosoma brucei gambiense
fecal samples should be washed with saline only because washing with waster will destroy:
Blastocytis hominis
The parasite that may invade and multiple in the liver or spleen is:
Leishmania donovani
The arthropods vector associated with the transmission of the fish tapeworm:
cyclops spp.
Obligate myiasis is associated with:
Cochliomyia spp.
The organism responsible for the lyme disease is transmitted to humans by:
Ixodes spp.
The nematode Loa loa is transmitted to human by:
Chrysops spp.
The mange mite is:
Sarcoptes spp.
The developmental stage not found in holometabolous metamophosis is the:
Pupa
The free swimming larva form found in the crustacean life cycle is called the:
cauplius
Babesia. spp, transmitted by a tick, is maintained in the tick population by:
Vertical transmission
Fly larvae were recovered from an open wound on the arm of a nursing home patient. this finding is
Facultative myiasis
Amor’s note: Obligate myiasis
Pediculosis is caused by:
Lice
The family that contains hard ticks is:
Ixodidae
Yersinia pestis is transmitted by:
Xenopsylla spp.
A larva was removed from a bedridden hospital patient’s nose. this condition is referred to as:
Nosocomial myiasis
The mite associated with asthma and respiratory symptoms is:
Dematophagoides spp.
Charcot-leyden crystals may be noted when examining fecal preparations. these crystals are associated with the immune response and are thought to be breakdown products of:
Eosinophils
The formalin-ethyl acetate concentration method for feces is used to demonstrate:
Protozoan cysts and helminth eggs
one of the following diagnostic procedures can be considered an urgent procedure (stat) that procedure is:
A blood film for malaria
The best test procedure for correctly identifying Enterobius vermicularis infections is the:
cellophane tape test
Ameba trophozoite motility is best observed using a:
Unstained saline wet mount
The intermediate host for Taenia saginata is:
Cow
Which cestode produces an operculated egg
Diphyllobothrium latum
A stained blood smear reveals giant platelets and many reticulocytes containing schuffners dots, large ring form, and schizont with 12-24 merozoites, you would report this parasite as:
plasmodium vivax
When purged specimens are to be examined for amebae, which of the following should be used yo obtain the specimen
Fleet phospho-soda
A small, operculated egg with a light bulb shape was found in the feces of a patient with liver abnormalities:
Clonorchis sinensis
Mature trophozoites and young schizonts in a blood smear shows a distinct tendency towards band formation and the red blood cell are not enlarged
Plasmodium malariae
Parasites produces eggs that are immediately infective to human and the eggs infect a person directly via ingestion
Enterobius vermicularis
intestinal protozoa is not identified as a causative agent of diarrhea?
Entamoeba coli
could be identified from the bloody sputum of an immigrant from the Far east?
Paragonimus westermani
In clinical cases of Wuchereria bancrofti, the most favorable time to find parasite in the blood is
Middle of the night
The trichrome stain is used to identify
Intestinal protozoa
The head of the scolex of D. latum
has two sucking grooves
eggs that has a large lateral spine
Schistosoma mansoni
best transport preservative for protozoa or flagella trophozoites?
Polyvinyl alcohol
The cystecercus larva form is found where noted as part of the life cycle of which parasite
in pork muscle, T. solium
Babesia spp. is transmitted to human by:
bite if an infected tick
A stained fecal smear reveals mononucleate flagellates with a comma-shaped posterior, and lemon-shaped mononucleate cysts with a clear, nipplelike bleb at one end. you would report this parasite as:
Chilomastix mesnili
Infection with brugia malayi is best diagnosed by:
Knott concentration test
Cercariae of this parasite penetrate the skin of humans, thereby causing infection
Schistosoma japonicum
Recovery of human feces of a 7-mm-long gravid proglottid containing right lateral uterine branches indicates infection with
Taenia solium
This parasite was found in the blood smear of a patient who had a recent summer vacation in New england and reported many insect and tick bites
Babesia spp.
Pinworm disease can be best diagnosed by using:
The cellophane tape test
can cause primary amoebic meningoencephalitis
Nargleria spp
because you are responsible for parasite control on an island, you chemically treat the small freshwater lake for snails, but you accidentally dump in too much chemical and kill every living thing in the lake. your action breaks the life cycle and controls the spread of which of the parasite?
Fasciolopsis buski
requires two different intermediate hosts in its life cycle
Trichuris trichiura
