PROTOZOA (Morphological Characteristics) PART 2

Chilomastix mesnili (Cyst Stage)

The cytosome is evident with a curved shepherd’s crook fibril.

Chilomastix mesnili (Trophozoite)

A pear shaped

Chilomastix mesnili (Trophozoite)

Have spiral groove and cork-screw like

Giardia lamblia (Trophozoite)

Flagellated protozoan parasite that colonizes

Giardia lamblia (Trophozoite)

The parasite attaches to the epithelium by a ventral adhesive disc.

Giardia lamblia (Trophozoite)

Falling leaf motility

Giardia lamblia (Trophozoite)

Have sucking disc

Giardia lamblia (Trophozoite)

8 flagella attached

Chilomastix mesnili (Trophozoite)

3 flagella attached

Enteromonas hominis (Trophozoite)

4 flagella attached

Retortamonas intestinalis (Trophozoite)

2 flagella attached

Trichomonas vaginalis (Trophozoite)

5 flagella attached

Giardia lamblia (Cystic Stage)

Can exist for prolonged periods outside the body

Giardia lamblia (Cystic Stage)

When it is ingested, stomach acid activates the cyst

Giardia lamblia (Cystic Stage)

It takes ingestion of only ten cysts to cause infection

Giardia lamblia (Cystic Stage)

Remnants of flagella

Giardia lamblia (Cystic Stage)

Have 4 Nuclei

Plasmodium falciparum (Ring form trophozoite)

Have delicate cytoplasm

Plasmodium falciparum (Ring form trophozoite)

One or two small chromatid dots

Plasmodium falciparum (Ring form trophozoite)

RBCs that are infected are not enlarged, multiple infection of RBCs

Plasmodium falciparum (Ring form trophozoite)

Multiple rings

Plasmodium falciparum (Ring form trophozoite)

Scanty cytoplasm

Plasmodium falciparum (Gametocytes)

Are crescent or sausage shaped

Plasmodium falciparum (Gametocytes)

The chromatin is in a single mass (Macrogamete) or diffuse (Microgamete)

Plasmodium falciparum (Gametocytes)

Black pigment chromatin

Plasmodium falciparum (Gametocytes)

Banana shaped microgametes

Plasmodium falciparum (Gametocytes)

Has 8-14 merozoites

Plasmodium vivax (Macrogametocyte)

Round to oval in cytoplasm

Plasmodium vivax (Macrogametocyte)

With scattered brown pigment

Plasmodium vivax (Macrogametocyte)

With peripherally located chromatin mass

Plasmodium vivax (Microgametocyte)

With large pink to purple chromatin mass

Balantidium coli (Cystic stage)

Round and have a tough, heavy cyst wall made of one or two layers

Balantidium coli (Cystic stage)

Usually only the Macronucleus

Balantidium coli (Cystic stage)

Cilia and contractile vacuoles are visible in the cyst

Balantidium coli (Cystic stage)

45×64 um

Balantidium coli (Cystic stage)

Have a small cytostome present

Balantidium coli (Trophozoite)

Two nuclei are visible

Balantidium coli (Trophozoite)

The macronucleus is long and sausage-shaped

Balantidium coli (Trophozoite)

The opening, known as the peristome, at the pointed anterior end leads to the cytostome.

Balantidium coli (Trophozoite)

Two visible vacuoles

Balantidium coli (Trophozoite)

Double cyst wall

CILIATE

Balantidium coli

COCCIDIA

• Isospora belli

• Sarcocystis spp.

• Cryptosporidium

BLASTOCYSTIS

Blastocystis hominis

Cryptosporidium spp. and Blastocystis hominis

Does not have cyst stage: