protozoan part 2
DESCRIPTION
Naegleria fowleri, Acanthamoeba, Balantidium coli, Giardia lamblia, Trichomonas vaginalis, Cryptosporidium parvum, Cyclospora cayetanensis, Toxoplasma gondii, Babesia microti, Philippine Medically Important Protozoan speciesTRANSCRIPT
Notes on Philippine Medically Important Protozoans Part 2 (Coccidian and Sporozoan) Meccar Moniem Elino, BSBio IV , Davao Doctors College Instructor: Mrs. Chalee Sienes-Reyes, RMT, MSMT, Ph.D
Reference: Philippine textbook of Medical Parasitology 2nd ed.(2004) UP. Edited by Vicente Y. Belizario, Jr. and Winifreda U. de Leon
Trophozoite Cyst Infective
Stage Transmission
Naegleria fowleri
Trophozoite with broad
pseudopods Actively motile
Forms the flagellate stage
Single-walled cyst Does not encyst in tissues
Cyst
penetration in broken skin or
entry thru olfactory
Acanthamoeba
Trophozoite with filamentous
pseudopods Sluggishly motile
Does not form flagellate stage Double-walled cyst
May encyst in tissues
Double-walled cyst May encyst in tissues
Cyst
penetration through
ulcerated or broken skin
Balantidium coli an actively motile ciliate; highly
specialized for reproduction and food intake (cytostome)
a latent survival stage is significant in transmission; infective stage with one
large nucleus cysts
ingestion of contaminated food or drink
with contaminated
water; fecal/oral
Giardia lamblia
flagellate protozoan( 10 x 10 um) having two large nuclei, a large
sucking disc, and many flagella; face - like appearance
slightly smaller the trophozoite with four nuclei and parabasal body
cyst
ingestion of contaminated food or drink
with contaminated
water; fecal/oral
Trichomonas vaginalis only a flagellate trophozoite with
four flagella and undulating membrane
x Trophozoite sexual contact
Cryptosporidium parvum Sporozoan(coccidian) parasite exhibits both asexual(schizogony) and sexual(gametogony) in the brush border of the intestinal epithelium
Oocyts are released from the cells and transmitted
sporulated oocysts
fecal/oral
Cyclospora cayetanensis a sporozoan(coccidian) parasite of the small intestine
asexual and sexual cycle similar to Cryptosporidium but oocysts are larger sporulated
oocysts
ingestion of contaminated food or drink
with contaminated
water; fecal/oral
Toxoplasma gondii
intracellular coccidian(sporozoan) parasite infecting various tissues(systemic) but confined to intestines in felines
infected tissues release pseudocysts containing bradyozoites feline intestines release oocyts containing tachyzoites
Pathogenesis : cellular death due to intracellular muliplication of trophozoites
especially severe in fetal and cerebral tissues
Eat of infected
undercooked/raw meat
Babesia microti The organisms resemble P.falciparum
they vary more in shape and in size; and they do not produce pigment evidence of Maltese cross formation
Bite/Skin
Penetration