MICR 2533 Worms - Name Common name Infection: Unique...

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Name Common name Infection: Unique features Diseases caused Intestinal roundworms Enterobius vermicularis Pinworm, seatworm Eggs, via hand to mouth. Infection is self- limited. Most common in USA; eggs found by cellophane test; worms are 0.25 to 0.5” Perianal itching (pruritis) Trichuris truciura Whipworm Ingestion of larvae- containing eggs from soil or hand-to-mouth Eggs are barrel shaped with a yellow- brown coat and hyaline plugs Rectal prolapse with heavy infection Ascaris lumbricoides Giant intestinal roundworm Ingestion of fertilized eggs with mature larvae / embryos (the larvae mature in warm, moist, oxygenated soil) Largest roundworm (up to 30 cm); most dangerous, most prevalent in world, 2 nd most common in US Ascariasis; larval migration thru liver and lungs can cause GI and respiratory pathologies, death Trichinella spiralis trichinosis Consumption of undercooked meat (pork) containing encysted larvae in striated muscle tissue Entire life cycle is within mammal; humans are accidental hosts. Death can occur. intestinal, migration, muscular, and focal lesion phases. Periorbital edema, splinter hemm of fingernails; muscle weakness / pain Necator Americanus (North and South America et al) New world hookworm Filariform larvae penetrate skin (via feet contact with soil / grass) Eggs hatch and form larvae outside body; Maturation to adult in intestinal phase Ground itch (cutaneous larval migrans) upon penetration; Pneumonitis, GI disturbances, anemia Ancyclostoma duodenale (Europe et al) Old world hookworm Same as above Same as above Same as above Ancyclostoma brazilienense (dog and cat) and caninum (dog) Dog and cat hookworm Filariform larvae penetrate skin Worms remain just under skin; can be seen tunneling (ewww!) Creeping eruption (CML, as above) Strongyloides stercoralis Threadworm Filariform larvae penetrate skin; autoreinfection by maturing larvae leaving intestine Mature worms are parthenogenic (all female, can reproduce without males) and can reproduce entirely
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MICR 2533 Worms - Name Common name Infection: Unique...

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