CLINICAL PARASITOLOGY LEC Flashcards
- Transformation of a trophozoite stage into a cyst stage
Encystation
- In which one individual divides into two of more or less equal parts
Binary fission
- Liberates daughter cells that are called merozoites
Schizogony
- Permanent and complete fusion of male and female gametes
Syngamy
- Interchange of nuclear material that takes place among ciliates
Conjugation
- Extension of the ectoplasm that aid amoeba in motility
Pseudopodia
- Lateral expansion of the plasma membrane associated with flagellum
Undulating membrane
- Specialized cell mouth found among the ciliates
Cytostome
- Dense cytoplasmic inclusions made up of crystalline RNA and RNA-binding proteins
Chromatoidal bodies
- A mass of chromatin located within the nucleus of certain protozoa
Karyosome
Transmission of Entamoeba histolytica occurs when:
the infective cysts are ingested in contaminated food or drink.
The most common site for extraintestinal amebiasis is
liver
Humans most often contract Naegleria fowleri by
swimming in contaminated water
Which of the following is the specimen of choice for the recovery of Naegleria
fowleri?
Cerebrospinal fluid
Etiologic agent of granulomatous amebic encephalitis is
Acanthamoeba
The pathogenicity of Entamoeba histolytica is indicated by the following , EXCEPT
size
Which of the following is the main difference between the trophozoites of
Entamoeba hartmanni and Entamoeba histolytica?
Trophozoites of E. hartmanni do not contain ingested red blood cells.
Which of the following correctly describes the nucleus of Endolimax nana?
Blotlike
Which of the following amoebae do trophozoites ingest white blood cells?
Entamoeba gingivalis
The term acanthopodia describes pseudopodia that are
spinelike
The following flagellates are found in the intestines, EXCEPT
Trichomonas tenax
The normal habitat of Giardia lamblia
duodenum
Individuals at risk for contracting Giardia lamblia when camping and hiking are encouraged to take which of these steps to prevent infection?
Use only bottled water for drinking, cooking & appropriate personal hygiene
Which of the following is suggested to be transmitted via the eggs of Enterobius vermicularis?
5Dientamoeba fragilis
The infective stage of Trichomonas vaginalis is
trophozoite
The main feature for attachment of Giardia lamblia
sucking disc
The motility of the trophozoites of Chilomastix
corkscrew
Which of the following has undulating membrane that is as long as the costa
Pentatrichomonas hominis
Enterotest is used to sample materials from the
duodenum
Lutzomyia sandflies
Leishmania braziliensis
Kalaazar
C. Leishmania donovani
Cutaneous leishmaniasis
Leishmania tropica
Romañas sign
Trypanosoma cruzi
East and Central Africa
T. b. rhodesiense
Flagellum is absent
Promastigote
Consists of a nucleus and a kinetoplast
Epimastigote
Its presence indicates positive xenodiagnosis
Trypomastigote
Isolated in NNN culture of Leishmania
Amastigote
Promastigote
Epimastigote
Trypomastigote
The infective form of Balantidium coli is the trophozoite
F
The main reservoir of Balantidium coli infection is man
F
Balantidium coli is present worldwide, but the prevalence of the infection is very low
T
Balantidium coil is the largest protozoan parasite residing in the large intestine of man
T
The slightly pointed anterior end of Balantidium coli trophozoite has a cytopyge.
F
Balantidium coli has two (2) dissimilar nuclei
F
The infective form of malaria parasite from the salivary glands of Anopheles
sporozoite
The actively dividing form of malaria parasite is known as
schizont
Malignant tertian malaria is caused by
Plasmodium falciparum
Which Plasmodium species preferentially infects old RBCs only?
Plasmodium malariae
most common cause of malaria in semi-tropical parts of the world is
Plasmodium vivax
In malaria microscopy, best staining results are achieved when using
Giemsa stain
Which Plasmodium species has crescent-shaped gametocytes
Plasmodium falciparum
The stippling in the P. vivax-infected red blood cells is known as
Schuffner’s stippling
Schizont with 6 to 12 merozoites in daisy-head formation is typical of
Plasmodium falciparum
The Quantitative Buffy Coat method for blood parasites is based on
fluorescence microscopy
- Originally thought to be a cyanobacterium.
Cyclospora cayetanensis
- The only known definitive hosts are members of family Felidae.
Toxoplasma gondii
- Humans become infected when they eat undercooked beef containing tissue cysts with bradyzoites.
Sarcocystis hominis
- Thin-walled oocysts initiate autoinfection of other enterocytes.
Cryptosporidium species