parasitology pictures

Fasciola hepatica (egg)

Fasciola hepatica (egg)

*operculum is falling off

Paragonimus westermani (egg)

Schistosoma haematobium (egg)
-trematode

Schistosoma mansoni (egg)
-trematode

NOTE: the big hook

Clonorchis sinensis (adult)

Clonorchis sirensis (egg)

NOTE: knob and operculum

Fasciola hepatica (adult)

Fasciolopsis buski (egg)

Fasciolopsis buski (adult)
-trematode
-largest intestinal fluke of humans

Paragonimus westermani (egg)

Paragonimus westermani (adult)

Schistosoma haematobium (egg)
-trematode

*the little pointed end

Schistosoma japonicum (egg)
-trematode

NOTE: the little hook

Loa loa
-nematode
-microfilaria

NOTE: giemsa stain, deep blue

Loa loa
-nematode
-microfilaria

*notice the converging nuclei into one row

*sheath is present

Onchocerca volvulus
-nematode
-microfilaria

*no sheath

Hookworm egg
-Necator americanus
-Ancylostoma duodenale
-nematode

*2-8 cell cleavages
*thin-smooth colorless shell

Wuchereria bancrofti
-nematode
-microfilaria

*the nuclei doesn't go up to the tip

*sheath present

Brugia malayi
-nematode
-microfilaria

*two nuclei at the tip of the tail

Enterobius vermicularis (egg)
-intestinal nematode

*notice the one flatter side

Trichuris trichiura (egg)
-intestinal nematode

*bipolar plugs

Ascaris lumbricoides (fertilized egg)
-intestinal nematode

*has a thick wall

Ascaris lumbricoides (unfertilized egg)
-intestinal nematode

*thinner shell than fertilized

Strongyloides stercoralis (adult and rhabditiform)
-intestinal nematode

*arrow is pointing to a spicule

Trichinella spiralis (adult)
-intestinal nematode
-affects muscles

Hymenolepis nana (egg)

*colorless shell
*filaments are emerging from the polar thickenings

T. saginata + T. solium (egg)
-cestode

*3 slightly visible hooks in center
*yellowish striations in embryo

Diphyllobothrium latum (egg)

*operculum on one end
*also a small knob on the edge

Echinococcus granulosus (cyst)
-cestode

Diphyllobothrium latum (proglottid)

Diphyllobothrium latum (scolex)
-cestode

*no cup-shaped suckers

Hymenolepis diminuta (egg)

*polar thickening on both sides
*visible hooks

Entamoeba histolytica/dispar (trophozoite)

*ingested RBCs may be visible in histolytica
*active progressive motility in wet mount

Entamoeba histolytica/dispar (cyst)

*1-4 nuclei
*may have a cigar shaped chromatoid bar
*similar to hartmanni cyst, but is much larger

Entamoeba hartmanni (trophozoite)

*similar to histolytica, but much smaller

Entamoeba hartmanni (cyst)

*similar to histolytica, but much smaller

Entamoeba coli (trophozoite)

*note the dot...absent in histolytica
*may ingest bacteria
*granular cytoplasm, sluggish motility

Entamoeba coli (cyst)

*similar to histolytica, BUT can have up to 8 nuclei
*chromatoid bars if present, have splintered/pointed ends

Endolimax nana (cyst)

*up to 4 nuclei
*ovoid shape

Endolimax nana (trophozoite)

*karysome is larger and deeper than E. hartmanni

Iodamoeba butschlii (cyst)

Iodamoeba butschlii (trophozoite)

*has visible glycogen vacuoles

Balantidium coli (trophozoite)

*more oval than the cyst
*ciliated
*CYTOSTOME (the little asscrack looking thing)

Balantidium coli (cyst)

*large circle with dumbbell looking nucleus

Chilomastix mesnili (trophozoite)

*4 anterior flagella
*curved posterior

Chilomastix mesnili (cyst)

*looks like it has fish hooks inside

Giardia duodenalis/lamblia (trophozoite)

*flagella
*looks like old woman

Dientamoeba fragilis (trophozoite)

*two nuclei
*no cyst

Giardia lamblia (cyst)

*no flagella, you can see them developing inside
*4 nuclei

Giardia lamblia/lamblia (trophozoite)

*note flagella
*looks like old woman

Trichomonas vaginalis

Plasmodium vivax (rings)

*RBCs become enlarged when infected, may be distorted

Plasmodium vivax (trophozoite)

*the one on the left is mature

Plasmodium vivax (shizont)

*12-24 merozoites, yellowish-brown pigment
*may stain darker as well

Plasmodium falciparum (rings)

*RBCs are not enlarged

Plasmodium falciparum (schizont)

*rarely seen in peripheral blood

Plasmodium ovale (rings)

*multiplied infected rings

Plasmodium ovale (gametocyte)

*round to oval, pigment is brown and is more coarse compared to P. vivax

Plasmodium ovale (schizont)

*6-14 merozoites with large nuclei clustered in a mass of dark pigment

Plasmodium malariae (rings)

*large chromatin dot

Plasmodium malariae (schizont)

*6-12 merozoites with large nuclei
*clustered around a mass of coarse dark-brown pigment
*sometimes arranged in a rosette pattern

Fasciola hepatica ova