Nematodes

Method of infection for E. vermicularis

ingestion of eggs and autoinfection

Adult enterobiasis live in a colon where do they deposit eggs

migrate out of the anus to deposit eggs and cause perianal itching

how are pinworms collected

scotch tape

What eggs are flat on one side and have a thick colorless shell and are embryonated

E. vermicularis

E. vurmicularis ova

E. vurmicularis ova

adult E. vemirmicularis have male and female worms, how do you tell the difference?

Males are smaller witha blunt posterior end and single spicule, females are larger and have a long pointed tail

E. vermicularis female adult

Ascaris lumbercoides method of infection

ingestion of eggs from soil

Ascariasis worm burden

Ascaris lumbricoides fertile ova

Ascaris lumbricoides fertile ova

Ascaris lumbricoides containing larva

Male ascaris lumbricoides

smaller and have curved tail

Female ascaris lumbricoides

larger and have straight tails

Method of infection for Trichuris trichiura

ingestion of eggs from soil

How do Trichuria attach to the cecum

anterior whip is threaded into the epithelium of the cecum

Heavy worm burden in children lead to

prolapsed rectum and hypochromic anemia

Trichuris trichiura Ova

Trichuris trichuria have what traits in adults

slender whip like anterior ends

Trichuris trichuria adult worms

Method of infection ancylosoma duodenale

Filariform larvae penetrate skin

Hookworm ova

Hookworm Ova with developed larva

Hookworm Rhabditiform Larva

Hook worm Filariform larva

Cutting Teeth

Ancylostoma duodenal adult mouth parts

Cutting plates

Necator americanus adult mouth parts

What is the infection method of Strongyloides stercoralis

Filariform larvae penetrate skin

What Syndrome is associated with Strongyloidiasis

Hyperinfection Syndrome

When Strongyloides infects the skin what can it elicit

allergic reaction of the skin

How can you tell Strongyloides stercoralis from Ancylostoma (hookworm)

• Strongyloides has a short buccal canal

• Prominant genital primordium

Strongyloides stercoralis rhabditiform larva

Strongyloides stercoralis Filariform Larva

What collection is the best for Strongyloides stercoralis

Duodenal aspirate

Anisakis simplex and pseudoterranova decipiens infect via

ingestion of raw fish infected with nematodes

Anisikiasis is associated with

eosinophilic granulomatous response mimicking chrons disease after 1-2 weeks

Baylisascaris procyonis (raccoon round worm) mode of infection

Accidental ingestion of eggs, usually seen in children

What are the more often severe disease manifestations of Baylisascariasis

• visceral larva migrans

• Ocular larva migrans

Where can Baylisascariasis in the body

CSF, Blood, eyes, and gut

Dracunculus medinesis method of infections

drinking unfilterd water containing copepods

What symptoms are associated with Dracunculiasis

• the worm emerges from an ulcer on the lower extremites

• secondary infection

Toxocara canis method of infection

accidental ingestion of eggs, frequently children

Toxocara canis adult and ova

What serious pathological changes can occur with toxocariasis

• visceral larva migrans

• ocular larva migrans

What tissues get invades by Toxocaris

liver, heart, lung, brain, muscle, eyes

Trichinella spiralis method of infection

ingestion of raw or undercooked meat

Trichonellosis invades what tissues

muscles, CNS, heart

What parasite causes spliter hemorrhages of the nails

Trichinella spiralis

Trichinella spiralis encysted in muscle tissue

Wushereria bancrofti is associated with

Elephantiasis and hydrocele