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Parasitology Chapter 10 Questions And Answers
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Parasitology Chapter 10 Questions And Answers Giardia lamblia G.lamblia adheres to the intestinal mucosa and appears intermittently in feces; therefore, three to six samples may be needed to successfully find the organisms. For which of the following parasites might the examination of as m...

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  • October 20, 2024
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Parasitology Chapter 10 Questions And
Answers

Giardia lamblia

G.lamblia adheres to the intestinal mucosa and appears intermittently in feces; therefore, three to

six samples may be needed to successfully find the organisms. For which of the following

parasites might the examination of as many as six specimens be needed in order to recover the

parasite:




Castor oil If patients must be purged to enhance recovery of parasites, any of the

following enemics may be used EXCEPT:




PVA (polyvinyl-alcohol)


PVA provides the best adhesion properties of the various preservatives listed. The

chemical found in fecal preservatives that enhance adhesion of parasites to slides prepared for

trichrome stain is:




Eosinophils


Charcot-Leyden crystals are thought to be disintegrating eosinophilic granules. Charcot-

Leydin crystals are occasionally observed in stool. These crystals are probably from breakdown

products of:

, Parasitology Chapter 10 Questions And
Answers

Non-nutrient agar plate seeded with E. coli bacteria

A non-nutrient agar plate seeded (inoculated) with E. coli bacteria is inoculated with a patient

sample or a possibly infected eye care solution to detect the presence of ameba. If Acanthamoeba

are present, they will feed on the bacteria and propagate, leading to increased numbers of ameba,

which can be observed directly on the plate when it is examined using a microscope. The

most sensitive method used to recover Acanthamoeba spp. from eye-care solutions or corneal

samples is the:




The decolorizer is weaker and you do not need to use heat

A weaker decolorizer is needed because parasitic cells do not bind the dye as tightly as AFB

cells. Modified acid-fast stain is used to visualize several parasites including

Cryptosporidium parvum. The modification that differentiates this method from that used to stain

mycobacteria (AFB) is that in the parasite method:




Pollen grains


Pollen grains commonly appear similar to eggs or cysts. An artifact found in feces that

can be confused with eggs or cysts is/are:

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