CIULLA_INTRODUCTION Flashcards
the most frequent symptom, along with abdominal cramping, seen in gastrointestinal tract infections
diarrhea
Parasitic Disease Risk Factors
- Unsanitary food handling/preparation (i.e., contaminated meats and
vegetables) - Contaminated water for drinking or recreational use
- Immunocompromised conditions resulting from disease states or poor nutrition
- Blood transfusion and organ transplantation
- Foreign travel to endemic regions of the world
most common specimen in parasitology
stool
amount of stool needed for most parasite analyses
3 g of fecal sample; three consecutive days
type of stool best for detecting trophozoites
liquid
type of stool best for detecting ova and cysts
formed
used as an all-purpose preservative to preserve stool specimens for conc. procedures
formalin (5%-10%)
T/F:
Stool specimens can be frozen upon delay in processing
FALSE
Additional note:
unpreserved specimens should not be stored at room temp longer than a couple of hours
mercury-containing preservative for preparing permanent stained smears
Polyvinyl alcohol (PVA)
mercury-free preservative that can be used to preserve stool samples for both conc. and permanent stained smears
sodium acetate formalin (SAF)
In less toxic preservatives, mercury is substituted with _______.
zinc sulfate
gross examination of stool detect _________.
adults forms (particularly helminths)
this procedure for feces remove debris that could obscure parasites.
Conc. procedures
T/F:
Barium is not removed during concentration procedures.
TRUE
