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Flashcards in World of Parasites Deck (22):
0

What is the common name for platyhelminthes?

flatworms

1

What is the common name for cestodes?

Tapeworms

2

What is the common name for trematodes?

flukes

3

What is the common name for nematodes?

roundworms

4

What is the common name for arthropoda?

insects, spiders, mites, and ticks

5

These are single celled parasites that contain many phyla.

protozoa

6

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

Helminths

7

What protozoan stage would you find in formed stool?

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

8

What protozoan stage would you find in liquid stool?

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

9

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

cysts, trophs, and eggs

10

What is the ratio of preservative to stool?

3 parts preservative : 1 part stool

11

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

PVA-Polyvinyl Alcohol

12

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

10% buffered Formalin

13

What two methods of concentration are based on specific gravity?

Flotation and sedimentation

14

What preservative is used in the floatation concentration technique?

Modified Zinc Sulfate

15

What is the specific gravity in concentration techniques?

1.18-1.20

16

What are the disadvantages of using the flotation technique?

dense eggs sink and operculated eggs rupture

17

What are advantages of doing flotation techniques?

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

18

What are the advantages of doing the sedimentation concentration techniques?

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

19

What are the disadvantages of using the sedimentation concentration techniques?

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

20

What are the advantages of doing permanent stains?

Able to view internal structures (trophs or cysts)

21

What is the most common/best permanent stain?

Trichrome