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Mycology > World of Parasites > Flashcards

World of Parasites Flashcards

0
Q

What is the common name for cestodes?

A

Tapeworms

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1
Q

What is the common name for platyhelminthes?

A

flatworms

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2
Q

What is the common name for trematodes?

A

flukes

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3
Q

What is the common name for nematodes?

A

roundworms

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4
Q

What is the common name for arthropoda?

A

insects, spiders, mites, and ticks

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5
Q

These are single celled parasites that contain many phyla.

A

protozoa

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6
Q

What are flatworms, tapeworms, flukes, and roundworms known as?

A

Helminths

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7
Q

What protozoan stage would you find in formed stool?

A

Cysts (and eggs); trophs wall themselves up to form cysts as protection

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8
Q

What protozoan stage would you find in liquid stool?

A

Trophs (and eggs); these are more motile and fragile, commonly found higher up in the GI tract

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9
Q

What protozoan stage can be found in semiformed/soft stool?

A

cysts, trophs, and eggs

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10
Q

What is the ratio of preservative to stool?

A

3 parts preservative : 1 part stool

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11
Q

This preservative serves as a fixative (mercuric chloride), is a resin for adhesion to the slide, and is used for PERMANENT smears.

A

PVA-Polyvinyl Alcohol

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12
Q

This preservative is used for concentrations or wet mounts, NOT smears.

A

10% buffered Formalin

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13
Q

What two methods of concentration are based on specific gravity?

A

Flotation and sedimentation

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14
Q

What preservative is used in the floatation concentration technique?

A

Modified Zinc Sulfate

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15
Q

What is the specific gravity in concentration techniques?

16
Q

What are the disadvantages of using the flotation technique?

A

dense eggs sink and operculated eggs rupture

17
Q

What are advantages of doing flotation techniques?

A

allows detection of most eggs, larvae, and cysts; also eliminates debris (will settle to the bottom)

18
Q

What are the advantages of doing the sedimentation concentration techniques?

A

allows detection of most eggs, larvae, and cysts by gravity or centrifugation

19
Q

What are the disadvantages of using the sedimentation concentration techniques?

A

Smaller eggs may not sediment; more fecal debris than flotation methods

20
Q

What are the advantages of doing permanent stains?

A

Able to view internal structures (trophs or cysts)

21
Q

What is the most common/best permanent stain?

Mycology (24 decks)

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