Parasites - Intestinal Protozoa Flashcards
Entamoeba histolytica infectious stage
Mature cysts ingested
Entamoeba histolytica diagnostic stage
Trophozoite and cysts in feces
Entamoeba histolytica info
pathogenic
associated with intestinal and extra intestinal infections
ingestion of RBCs
Entamoeba histolytica classification
Intestinal amoeba
Entamoeba bangladeshi info
can only differ from histo/dispar by a small subunit rRNA gene sequence
Endolimax nana info
troph - single nucleus, irregular shape, large karyosome
cysts - 4 nuclei, large karyosome with no peripheral chromatin, cytoplasm may contain glycogen
Iodamoeba buetschlii info
troph - single nucleus, large central karyosome, refractive achromatic granules
cysts - single nucleus, large eccentric karyosome, large glycogen vacuole
Blastocystis hominis info
only grows in presence of bacteria
ingests bacteria
central body vacuole 70% of cell
up to 6 nuclei
Balantidium coli infectious stage
Cyst - acquired by the host through ingestion of contaminated food or water
Balantidium coli diagnostic stage
Cyst in feces
Balantidium coli info
pathogenic
swine are animal reservoir
bean shaped macronucleus
Balantidium coli classification
Ciliate
Giardia lamblia infectious stage
Contamination of water, food, or hands/fomites with infective cysts
Giardia lamblia diagnostic stage
Trophozoites are also passed in stool but do not survive in environment
Giardia lamblia info
bilateral symmetry - sucking disks, 2 median paranasal bodies associated with flagella, central axostyle central attachment of flagella
falling leaf motility
Giardia lamblia classification
Intestinal flagellate - pathogenic
Dientamoeba fragilis infectious stage
trophozoites ingested
Dientamoeba fragilis diagnostic stage
trophozoites in feces
Dientamoeba fragilis info
asymmetrical ameboid form
80% contain 2 nuclei
pseudopods for motility
Dientamoeba fragilis classification
intestinal flagellate - pathogenic
Chilomastix mesnili infectious stage
Contamination of water, food, or hands/fomites with infective cysts
Chilomastix mesnili diagnostic stage
Trophozoite in feces
Chilomastix mesnili info
pear shaped troph
single large nucleus below outer membrane
lemon drop shaped cyst
distinct hyaline knob
Chilomastix mesnili classification
Intestinal flagellate - nonpathogenic
Pentatrichomonas hominis infectious stage
Contamination of water, food, or hands/fomites with infective cysts
Pentatrichomonas hominis diagnostic stage
Trophozoite in feces
Pentatrichomonas hominis info
teardrop shaped troph
single nucleus displaced from outer membrane
undulating membrane full length of organism
Pentatrichomonas hominis classification
Intestinal flagellate - nonpathogenic
Cryptosporidium infectious stage
Thick walled oocyst ingested by host
Cryptosporidium diagnostic stage
Thick walled oocyst (sporulated) exits host
Cryptosporidium info
small intestine most common site
Cryptosporidium classification
Coccidia
Cyclospora cayetanensis infectious stage
Ingestion of contaminated food/water
Cyclospora cayetanensis diagnostic stage
Excretion of unsporulated oocysts in stool
Cyclospora cayetanensis classification
Coccidia
Cystoisospora belli infectious stage
Mature oocysts with sporozoites
Cystoisospora belli diagnostic stage
Oocysts in feces
Cystoisospora belli info
pathogenic eosinophilia may be present ellipsoidal shape oocyst matures after excretion single sporoblast divides into 2 sporocysts
Cyclospora cayetanensis info
sporulation is temp dependent taking several weeks for an infective oocyst to contain 2 sporocysts
