Flashcards in Chpt 17 - Common Laboratory Procedures for Diagnosing Parasitism Deck (26):
Mineral deposits unique to tapeworms
Calcareous bodies or calcareous corpuscles
Instrument used to calibrate a compound microscope
Weight of an object compared with the weight of an equal volume of pure water
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
Messy to work with because it is quite sticky; it is a sugar solution.
Sodium nitrate solution
Most efficient flotation solution, but it forms crystals and distorts eggs
Saturated sodium chloride
Least desirable flotation solution - it can corrode the microscope
Zinc sulfate solution
Cystic stages of Giardia are best concentrated with this flotation medium
Simple flotation technique
Does not require the use of a centrifuge.
Fecal sedimentation technique
Used primarily in suspected trematode (fluke) infections.
Indicate the number of eggs or cysts present in each gram of feces.
Modified D'Antoni's iodine
Used to stain protozoan cysts such as Giardia
A process of development that takes place within a coccidian oocyst.
Sporulated oocyst of Eimeria
Four sporocysts, each with two sporozoites
Sporulated oocyst of Cystoisospora
Two sporocysts, each with four sporozoites
Cellophane tape preparation
Collection of eggs of pinworms such as Oxyuris equi
An apparatus used to collect larval nematodes from fresh feces. A funnel is an essential part of this apparatus.
Modified Knott's procedure
Used to differentiate microfilariae of Dirofilaria immitis from those of Acanthocheilonema reconditum.
Immunologic heartworm test
Many of these "color change" test kits use antibodies against adult D. immitis antigen
Occult heartworm infection
Dog has adult heartworms but does not demonstrate circulating microfilariae.
A term meaning "without microfilariae"
Microscopic exam of urine sediment
Detection of ova of Dioctophyma renale or Stephanurus dentatus
Performed using a number 10 scalpel blade
Finding organisms (protozoans) in preputial washings of infected bulls