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PHMY 610 PARASITES EXAM QUESTIONS AND VERIFIED ANSWERS
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PHMY 610 PARASITES EXAM QUESTIONS AND VERIFIED ANSWERS...
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PHMY 610 PARASITES EXAM QUESTIONSAND VERIFIED ANSWERS
this is when both symbiotic species benefit
mutualism
this is when one species benefits and the other is unharmed
commensalism
this is when one species benefits and the other is harmed
parasitism
what are the risk factors for parasitic infections
-Immunocompromised patients, neonates, elderly, those with chronic diseases
-Travel to countries with endemic parasites
-Immigrants from areas with endemic parasites
protozoa lack what?
cell walls
protozoa are unicellular or multicellular? eukaryotes or prokaryotes?
unicellular eukaryotes
what is the life cycle of protozoa
trophozoites (active feeding stage in humans) -> cyst formation -> cyst
(dormant resting stage, infective stage in human host) -> trophozoites
reactivated (cyst wall break down)
what are two ways that protozoa are classified
locomotion and infection site
in amoeba, what facilitates locomotion?
pseudopodia
in flagellates, what facilitates locomotion/feeding
, whip like structures
in sporozoa, what facilitates locomotion
nothing, they do not move (spore forming)
how do coccidia move
gliding
what are the three types of infection sites for protozoa
intestinal tract, urogenital, blood/tissue
what are four examples of intestinal and urogenital protozoa
Entamoeba histolytica, · Giardia lamblia, Cryptosporidium parvum,
Trichomonas vaginalis
entamoeba histolytica is an intestinal protozoa and amoeba - who is at highest
risk for infection?
areas with poor sanitation, MSM, immunocompromised, (in US)
immigrants/travelers from endemic countries
how is entamoeba histolytica transmitted
fecal-oral route (contaminated food/water)
what is the clinical disease caused by entamoeba histolytica
amebiasis
what is the clinical presentation of entamoeba histolytica
90% asymptomatic; 10% symptomatic - colitis with abdominal pain and
mucoid, watery, or bloody diarrhea
how can entamoeba histolytica be diagnosed
-Stool culture for microbiologic identification
-For intestinal disease - antigens/DNA PCR in stool
-For extra-intestinal disease - IgM or IgG antibodies (serology)
giardia lamblia is classified as flagellate and intestinal protozoa - who at risk for
infection?
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