Parasite lab pictures

Ascaris lumbricoides ovum

Thick shell with no gap

Ascaris lumbricoides infertile ovum

Longer than fertile, no larva

Ascaris lumbricoides adult female

Enterobius vermicularis ovum

Football with one side flatter

Enterobius vermicularis adult female

Filled with eggs, pointed end

Trichuris trichiura ovum

Thick shell, polar plugs are each end

Trichuris trichiura adult female

Thin anterior end

Hookworm ovum

Gab between larva and egg shell

Hookworm rhabditiform larvae

Long bucal cavity

Strongyloides stercoralis rhabditiform larva

Long genital primordium

Trichinella spiralis larva

Spiral shape encapsulated larvae in muscle tissue

Wuchereria bancrofti microfilaria

Diphyllobothrium latum ovum

abopercular end has knob

Hymenolepis diminuta ovum

has 6 hooks in oncosphere

Hymenolepis nana ovum

has polar filaments

Taenia spp. ovum

spindles around edge

Taenia solium proglottid

smaller, <12 uterine branches

Taenia saginata proglottid

bigger, >12 uterine branches

Taenia solium scolex

has hooks, 4 suckers

Taenia saginata scolex

no hooks, 4 suckers

Dipylidium caninum egg packet

Clonorchis sinensis ovum

has shoulders

Paragonimus westermani ovum

thickened abopercular end

Schistosoma japonicum ovum

inconspicuous spine

Schistosoma haematobium ovum

terminal spine

Schistosoma mansoni ovum

lateral spine

Schistosoma spp. adult copulating pair

Adult tissue fluke

can be seen with naked eye, look like leaves

Plasmodium falciparum trophozoite ring

no RBCs, thick smear

Plasmodium falciparum trophozoite ring

RBCs present, delicate, multiply infected cells, appliqué formation, headphone trophs, thin smear

Plasmodium falciparum gametocyte

banana/canoe shape

Plasmodium vivax gametocyte

molding, larger infected RBC, Schuffner's dots

Plasmodium ovale gametocyte

oval RBC, Schuffner's dots

Plasmodium malariae trophozoite ring

basket (thickened), can have bird's eye, rosette in schizont, infect small/dying RBCs

Plasmodium malariae merozoites

Babesia microti rings, merozoites

pleomorphic, Maltese cross (usually only see 2)

Cryptosporidium parvum oocyst

4-5

Cyclospora cayetanensis oocyst

8-10

Cystoisospora belli oocyst

25-30

Toxoplasma gondii tachyzoite

Giardia duodenalis cyst

4 nuclei

Giardia duodenalis trophozoite

2 nuclei

Chilomastix mesnili cyst

knob

Chilomastix mesnili trophozoite

pear shape, 1 nuclei

Pentatrichomonas hominis trophozoite

pear shape, 1 nuclei, granules

Dientomoeba fragilis trophozoite

2 nuclei, fragmented karyosome

Leishmania amastigote

very small

Leishmania promastigote

Trypanosoma cruzi trypomastigote

Trypanosoma brucei trypomastigote

Entamoeba coli cyst

up to 8 nuclei, splintered chromatid bodies

Entamoeba coli trophozoite

Entamoeba histolytica/dispar cyst

up to 4 nuclei, blunted chromatid bodies

Entamoeba histolytica trophozoite

ingested RBCs

Endolimax nana cyst

Iodamoeba butschlii cyst

large vacuole

Iodamoeba butschlii trophozoite

Balantidium coli cyst

ciliate

Balantidium coli trophozoite

ciliate

Blastocystis hominis vacuolar Form

Microsporidia spore

edges stain, modified AFB +

Pediculus humans var. capitis (head louse)

6 legs

Phthirus pubis (pubic louse)

6 legs

Sarcoptes scabiei (scabies mite)

8 legs

Ixodes scapularis (deer tick)

8 legs, anal groove. Vector of Borrelia, Anaplasma, Babesia and Powassan virus

Dermacentor virabilis (American dog tick)

8 legs. Vector of Rickettsia

Which are pathogenic

All helminths, Giardia, Dientomoeba, and Entamoeba histolytic