Intensive Recap Flashcards
In a patient with diarrhea, occasionally E. histolytica (4 nucleated cysts, no chromatoidal bars) are identified as being present; however, these cells, which are misdiagnosed as protozoa, are really:
PMN leukocyes
Rhabditoform larva with purposeless motion and short buccal cavity:
Strongyloides
The term INTERNAL AUTOINFECTION is generally used in referring to infections with:
S. stercoralis
The mouth of Necator americanus is characterized by the presence of:
Cutting plates
Microcytic anemia is assoc. with this parasite:
Ancylostoma duodenale
The infective stage is the sheathed filariform larva:
Ancylostoma duodenale
Habitat of adult Trichinella spiralis:
Small intestines
Which of the following microfilariae is unsheathed?
Onchocerva volvulus (skin snips; stained by Giemsa or H and E)
Suitable specimen for the ID of microfilaria:
Blood
Technique to best diagnose microfilaria while still visible in the PB:
Knott’s technique
Visceral larva migrans is assoc. with this organism:
T. canis
Charcot Leyden crystals in stool may be assoc. with an immune response and are thought to be the breakdown products of:
Eosinophils
Nematode parasite thought to have been the “fiery serpent” of the ancient parasites. This parasite, which has various species of Cyclops as its IH, is:
Dracunculus medinensis
*Medicine - Rod of Asclepius
A dog parasite that almost never develops to an adult in human has been found in some persons as a cause of a subcutaneous nodule or a solitary peripheral nodule in the lung. This nematode is:
D. immitis
The adult female is characterized by having a barber’s pole appearance due to ghe loopong of the whitish uterus around the reddish digestive tract:
Angiostrongylus cantonensis
Operculated ovum containing a miracidium and can appear in sputum, often accompanied by blood and Charcot-Leyden crystals:
Paragonimus westermani
Infetive stage of the Schistosomes to their final host:
Cercaria
Which of the following organisms penetrates the skin, is endemic in Africa and the Middle Easy, has large terminal spine on its eggs, and is found in urine sample:
S. haematobium
Cysticercosis is caused by the disseminated larve of:
T. solium
In some individuals, this worm can cause a megaloblastic anemia:
D. latum
A 45 y/o male sheepherder in California presents with “hepatitis”. Since other criteria are not met, X-ray-angiography was performed of the abdomen with the results that a tumor-like body is revealed within the love. Bc of his occupation, a Casoni test is peformed and found (+). Surgical removal of this “tumor” reveals a large cyst full of hydatid sand. What is the most likely etiologic agent involved in this infection?
Echinococcus granulosis
What trophozoite is distinguished by the posession of achromatic granules surrounding its karyosomal chromatin?
Iodamoeba butschlii
What is the most dependable procedure for the accurate, specific diagnosis of an intestinal amebic infection?
Permanently stained smear
A soil and water amoeba isolated from cases of meningoencephalitis:
Naegleria
The method of choice to detect Acanthamoeba spp. from corneal ulcer acrappings is:
BAP flooded with a 24H grow of E. coli
A protozoan organism the has been implicated in water borne and food borne outbreaks. The suspected organism is:
G. lamblia
The string test (Entero-Test) for obtainin a small specimen of duodenal contents for parasitic infection would be most appropriate for:
G. lamblia
A 15 y/o male return from a summer in Paraguay ina village infested with reduvid bugs and presents with fever. Based on his recent travel history, a Giemsa-stained BS analysis is performed and shows presence of parasites. What is the most likely etiologic agent involved in this infection?
T. cruzi
Xenodiagnosis is usually peformed for the diagnosis of:
T. cruzi
Asexual life cycle of malaria parasite occur in:
Man
Plasmodium spp. which has an affinity for mature or older RBCs:
P. malariae
Stage predominantly seen in the smear is the band form of developing trophozoite:
P. malariae
Which spp. of Plasmodium can have erythrocytic stages capable of causing relapses months or years after initial infection?
P. ovale
Which of the following statements is correct for Plasmodium falciparum?
✅ Infection is commonly known as Maligtant Tertian Malaria
✅ Tiny ring forms, multiple infected RCs and “accole” rings
✅ Granulocytes are cresent shaped
The observation of piroplasts in packets of 2 to 3 or a Maltese cross formation in stained BF most likely indicates:
Babesia microti
The demonstration of chorioretinitis and cerebral calcifications in a mewborn would result in which of these laboratory request?
Titer of Toxoplasma Abs
What constitutes a positive result in the Sabin-Feldman dye test?
Toxoplasma loses its affinity for methylene blue dye
The modified acid-fast stain is most often used in parasitology to ID:
Cryptosporidium and other coccidia
Oocysts of Cryptosporidium parvum can be detected in stool specimens using:
Modified Ziehl-Neelsen acid-fast stain
The ideal temperature to hold a fecal specimen for more then 1 hour is:
Refrigerator temp.
The procedure that determines the number of eggs per gram of feces is:
Stoll’s dilutiom technique
