Para Flashcards
Artifacts found in a stool specimen that can be confused with ova or cysts are:
Pollen grain
Polyvinyl alcohol used in the preparation of permanently stained smears of fecal material:
Serves as an adhesive
A method to culture acanthamoeba species from corneal ulcer scrapings is to inoculate
An agar plate overlaid with eschericia Coli
Primary amoebic encephalitis is caused by;
Naegleria Fowleri
A formed stool is received in the laboratory at 10:30 pm for ova and parasite exam.
Preserve the specimen in formalin until it can be examined
The advantage of thick blood smears for malarial parasites is to:
Improve detection of the organisms
This parasite is transmitted by accidental ingestion of cat feces that contain oocyte and by ingestion of undercooked meat that has tissue cysts
Toxoplasma gondii
A 44-year old man is admitted to the hospital following a 2-week history of low-grade fever, malaise and anorexia
Plasmodium falciparum
A wright-stained peripheral smear reveals the following: (this is consistent with plasmodium )
Vivax
A patient is suspected of having amoebic dysentery
Entamoeba histolytica
Trophozoïtes of the cyst shown in the image are likely to:
Have slow, undefined motility
Upon finding the organism shown in a fecal concentrate, the technologist should:
Review the fecal concentration carefully for the presence of other microorganisms that may be pathogenic
Which organisms are shown together in the image
E. Histolytica and E. Hart manni
The structure on the right in the image depicts a:
Cyst of non pathogenic amoeba
The organism shown in the image is a (n) (may parang eyes and like mumu
Flagellate
A 24-year old woman, who just returned from vacationing in Lebanon
Giardiasis
A liquid stool specimen is collected at 10:00 pm and brought to the laboratory for culture and ova and parasite examination.it is refrigerated until 10:10 am the next day, when the physician requests that the technologist look for amoebic trophozoites
Request a fresh specimen
Small protozoan get are found in a wet mount of sediment from ethyl- acetate concentrated material.
Endolimax nana
The term “internal auto infection” is generally used in referring to infections with:
Strongyloides stercoralis
A fibrous skin nodule is removed from the back of a patient from Central America.
Onchocerca volvulus
The egg shown in the image is most likely to be found in children suffering from:
Perianal itching
The specimen of choice for finding the parasite shown in the image is:
Scotch tape preparation
Human feces is not a recommended specimen in the detection of:
Echinococcus granulosus
The causative agent of cysticerosis is:
Tania solium
Organisms that can be easily identified to the species level from the ova in fecal specimens include:
Paragonimus westermani, hymenolepis nana
The preferred specimen for the diagnosis of paragonimiasis is:
Sputum
A stool specimen for ova and parasite examination contained numerous rhabditiform larvae. Which factors aid in the identification of larvae?
Length of the buccal cavity and appearance of the genital primordial
Which one of the following routine tests for entamoeba histolytica has the highest sensitivity and specificity?
Stool EIA
What is the principal means of distinguishing entamoeba histolytica from entamoeba Hartmann by light microscope?
Size of trophozoite
Which characteristic will identify lodamoeba butschilii?
Prominent vacuole in the cyst form
The only medically significant ciliate organism is:
Balantidium coli
Where do plasmodium sporozoites proliferate?
Liver
Individuals who lack the Duffy antigen on the surface of their RBC are protected against which species of plasmodium?
P. Vivax
Which nematode produces eggs with characteristic hyaline polar plugs at each end, as in the image?
Trichuris trichiura
Which nematode has a characteristic mammillated bile stained egg, as in the image?
Ascaris
Which organism is predominantly responsible for visceral larva migrant?
Toxocara canis
Which organism has the largest egg?
Fasciola
The eggs of which species of schistosoma can be isolated from urine?
S. Haematobium
Which one of the following features of Tania saginata helps distinguish it from T. Solium?
Unarmed rostellum
Infection by this organism can cause B12 deficiency;
Diphyllobothrium latum
The organism is responsible for hydrated cysts of the liver:
Echinococcus
How is trichomonas vaginalis transmitted ?
Sexual contact
This parasite has the following characteristics:
a. Banana shaped gametocgtes in RBCs
b. Multiple ring forms in RBCs
c. All RBCs are infected
Plasmodium falciparum
This parasite has the following characteristics:
a. Stains red with acid-fast stain
b. Zoonotic transfer to humans
c. Spread by fecal-oral route
Cryptosporidium
