Exam 2 Flashcards
(229 cards)
What is the only parasitic protozoan of the small intestine?
Giardia lamblia
steatorrhea-
fatty stool
does giardia feed on host tissues?
no
What host immune response is elicited against giardia?
IgA
What microscopy shows giardia covering GI tract?
SEM
When will you see giardia trophs in fecal sample?
watery diarrhea (not enough time to encyst)
Which tests are for giardia in GI tract?
ELISA for parasite antigen string test (enterotest)
Rx for giardia:
Flagyl (metronidazole)
Tindamax (tinidazole) = DOC
Nitazoxanide
Furazolidone-for children
Which two giardia drugs cant be taken with alcohol?
flagyl and tindamax
The commensal oral trichomonad?
T. tenax
The commensal GI trichomonad?
P. hominis
Trichomonas vaginalis:
vagina and urethra of females
urethra, seminal vesicles and prostate of male
vaginalis trichomoniasis
•Transmission:
•Trophs cannot survive outside host
sexual contact
What is pathology of T. vaginalis?
lyses and eats epithelial cells
Dx. of T. vaginalis
- wet mount of genital secretions
- OSOM Trichomonas Rapid Test (ELISA tests for parasite antigen, doctor can do this test)
- anaerobic in vitro culture
transmission can occur congenitally, but…..
parasite does not cross placenta or cervix. infant is infected during birth. RARE
Rx for Trichomonas vaginalis
Flagyl. 7 day bid or tid (2x a day or 3x a day)
no immunity
why is a lysosomal response not initiated in a cell invaded by an apicomplexan
they force their way in, they are not endocytized
Apicoplast is considered to be a relic of a:
chloroplast
During schizogony, multiple ______ occur, but only one ____ occurs
nuclear divisions
cytokinesis (into as many parts as there are nuclei)
chickens infected with eimeria contract “bloody cecum” aka:
cecal coccidiosis
ingestion of what stage of eimeria infects chickens?
sporulated oocyst
Chicken host defenses against eimeria:
shed epithelial cells, pass with feces before invading cell, macrophages kill a few
Isospora belli is now called:
Cystoisospora belli