Chpt 17 - Common Laboratory Procedures for Diagnosing Parasitism Flashcards Preview

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Flashcards in Chpt 17 - Common Laboratory Procedures for Diagnosing Parasitism Deck (26):
1

Mineral deposits unique to tapeworms

Calcareous bodies or calcareous corpuscles

2

Stage micrometer

Instrument used to calibrate a compound microscope

3

Ocular micrometer

Eyepiece scale

4

Specific gravity

Weight of an object compared with the weight of an equal volume of pure water

5

Flotation solutions

Concentrated sugar or various salts added to water to increase its specific gravity and thus make parasite eggs float because they are lighter than the solution

6

Sheather's solution

Messy to work with because it is quite sticky; it is a sugar solution.

7

Sodium nitrate solution

Most efficient flotation solution, but it forms crystals and distorts eggs

8

Saturated sodium chloride

Least desirable flotation solution - it can corrode the microscope

9

Zinc sulfate solution

Cystic stages of Giardia are best concentrated with this flotation medium

10

Simple flotation technique

Does not require the use of a centrifuge.

11

Fecal sedimentation technique

Used primarily in suspected trematode (fluke) infections.

12

Quantitative procedures

Indicate the number of eggs or cysts present in each gram of feces.

13

Modified D'Antoni's iodine

Used to stain protozoan cysts such as Giardia

14

Sporulation

A process of development that takes place within a coccidian oocyst.

15

Sporulated oocyst of Eimeria

Four sporocysts, each with two sporozoites

16

Sporulated oocyst of Cystoisospora

Two sporocysts, each with four sporozoites

17

Cellophane tape preparation

Collection of eggs of pinworms such as Oxyuris equi

18

Baermann apparatus

An apparatus used to collect larval nematodes from fresh feces. A funnel is an essential part of this apparatus.

19

Modified Knott's procedure

Used to differentiate microfilariae of Dirofilaria immitis from those of Acanthocheilonema reconditum.

20

Immunologic heartworm test

Many of these "color change" test kits use antibodies against adult D. immitis antigen

21

Occult heartworm infection

Dog has adult heartworms but does not demonstrate circulating microfilariae.

22

Amicrofilaremic

A term meaning "without microfilariae"

23

Microscopic exam of urine sediment

Detection of ova of Dioctophyma renale or Stephanurus dentatus

24

Skin scraping

Performed using a number 10 scalpel blade

25

Tritrichomonas foetus

Finding organisms (protozoans) in preputial washings of infected bulls

26

Otodectes cynotis

Diagnosed using ear smear procedure