MMSC 428 Final (new stuff) | University of Delaware | Questions with 100%
Verified Answers | Latest Update
Question: Intestinal Protozoa
Answer:
Found in humans transmitted by fecal-oral route via the cyst stage
Question: Entamoeba histolytica
Answer:
Can cause invasive infections Morphology - ingested RBCs in trophozoites Diagnosis -
Charcot-Leyden crystals
Question: Entamoeba coli
Answer:
Nonpathogenic Similar to E. histolytica but larger Glycogen vacuole present in cysts
Question: Intestinal Ciliates
Answer:
Pigs are the natural host → humans = accidental
Question: Balantidium coli
Answer:
Bean shaped macronucleus Ciliated troph
Question: Giardia Duodenalis - Lambila/Intestinalis
Answer:
Ventral sucking disk Chronic diarrhea and weight loss or asymptomatic 4 pairs of flagella
Entero-Test(string test)
Question: Cryptosporidum Parvum/Hominis
Answer:
Uses special stains for microscopy - mod. acid-fast/auramine-rhodamine(POSITIVE) Oocysts
- 4-6um
, Question: Cyclospora cayetanensis
Answer:
Humans are only known host Linked to foodborne outbreaks in US Asexual and sexual
reproduction occurs inside host intestinal cells Autofluorescence(POSITIVE) using UV
microscopy and mod. acid-fast stain Oocysts - 8-10um
Question: Microsporida
Answer:
Chromotrope 2R stain
Question: Strongyloides stercoralis
Answer:
Threadworm Autoinfection possible Cutaneous - larva currens/racing larva Diagnosis -
rhabditiform larvae = noninfectious Similar to hookworm - microscopic detection of eggs in
concentrated wet mount to differentiate from S. stercoralis
Question: Trichuris trichiura
Answer:
Human whipworm Diagnosis - exam stool for eggs “Polar plugs”
Question: Enterobius vermicularis
Answer:
Pinworm Humans only known host Eggs are released in perianal region → perianal itching
Diagnostic - cellophane “Scotch tape” Prep
Question: Ascaris lumbricoides
Answer:
Giant roundworm Most common human helminth infection High worm burden often show
symptoms and have complications - kid with worms coming out of his mouth
Question: Intestinal cestodes
Answer:
Tapeworms - parasites of small intestine Segments = proglottids Proglottids = ratio of width to
length and number of uterine branches Egg morphology
Verified Answers | Latest Update
Question: Intestinal Protozoa
Answer:
Found in humans transmitted by fecal-oral route via the cyst stage
Question: Entamoeba histolytica
Answer:
Can cause invasive infections Morphology - ingested RBCs in trophozoites Diagnosis -
Charcot-Leyden crystals
Question: Entamoeba coli
Answer:
Nonpathogenic Similar to E. histolytica but larger Glycogen vacuole present in cysts
Question: Intestinal Ciliates
Answer:
Pigs are the natural host → humans = accidental
Question: Balantidium coli
Answer:
Bean shaped macronucleus Ciliated troph
Question: Giardia Duodenalis - Lambila/Intestinalis
Answer:
Ventral sucking disk Chronic diarrhea and weight loss or asymptomatic 4 pairs of flagella
Entero-Test(string test)
Question: Cryptosporidum Parvum/Hominis
Answer:
Uses special stains for microscopy - mod. acid-fast/auramine-rhodamine(POSITIVE) Oocysts
- 4-6um
, Question: Cyclospora cayetanensis
Answer:
Humans are only known host Linked to foodborne outbreaks in US Asexual and sexual
reproduction occurs inside host intestinal cells Autofluorescence(POSITIVE) using UV
microscopy and mod. acid-fast stain Oocysts - 8-10um
Question: Microsporida
Answer:
Chromotrope 2R stain
Question: Strongyloides stercoralis
Answer:
Threadworm Autoinfection possible Cutaneous - larva currens/racing larva Diagnosis -
rhabditiform larvae = noninfectious Similar to hookworm - microscopic detection of eggs in
concentrated wet mount to differentiate from S. stercoralis
Question: Trichuris trichiura
Answer:
Human whipworm Diagnosis - exam stool for eggs “Polar plugs”
Question: Enterobius vermicularis
Answer:
Pinworm Humans only known host Eggs are released in perianal region → perianal itching
Diagnostic - cellophane “Scotch tape” Prep
Question: Ascaris lumbricoides
Answer:
Giant roundworm Most common human helminth infection High worm burden often show
symptoms and have complications - kid with worms coming out of his mouth
Question: Intestinal cestodes
Answer:
Tapeworms - parasites of small intestine Segments = proglottids Proglottids = ratio of width to
length and number of uterine branches Egg morphology
