Balantidium coli

Aphasmidia

Trichuris trichuira

• OVA• Barrel shaped egg• Protruded hyaline plug • Smooth egg shell

Trichinella spiralis

• Encysted LARVA• Muscle biopsy• Week 3 to 4

Capillaria philippinensis

• OVA• Peanut shaped• Flattened hyaline plug• Pitted egg shell

Phasmidia

Ascaris lumbricoides

• Unfertilized OVA– Disorganized yolk cells

(tiny bubbles)REFRACTILE GRANULES

– Thin shell– Irregular mammilated – Albuminous layer

Ascaris lumbricoides

• Fertilized OVA• Ovoid• Goldenbrown color

– Coarse lecithin granules – Vitelline layer– Glycogen membrane – Albuminous coat

• Mamilation

Enterobius vermicularis

• Ova– Shape: PLANOCONVEX– Contains EMBRYO – Perianal region

Enterobius vermicularis

• Male adult – Spindle shape– Postrior end curved

ventrally

Enterobius vermicularis

• Female Adult• Sharply pointed

posterior end

HOOKWORM spp

• Ova• 4-8 cell stages

Hookworm spp

• Rhabditiform Larva– Short esophagus– Bulbous posteriorly– Long buccal cavity– Small genital

primordium – “snake-like”

HOOKWORM spp

• Filariform Larva– short esophagus– Pointed tail– “lashing”

Hookworm

• Male adult• A. caninum

Hookworm

• Female adult• A. caninum

A. caninum

• Buccal cavity

Strongyloides stercoralis

• Rhabditiform larva– Short buccal cavity– Large genital

primordium

Strongyloides stercoralis

• Filariform larva– Long esophagus– Notched tail

Filaria

Wuchereria bancrofti mcf

• Sheathed• Tail tappered to a point• Free from nuclei• “graceful” curve

Brugia malayi mcf

• Tail tappered• 2 discrete nuclei in the

tip of the tail • “kinky” body