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lecture 30 lee

2 forms of protozoa cyst and trophozoite
trophozoite actively feeding organisms in the host niche
protozal cysts metabolically inactive form that can survive under very unfavorable conditions, resistant to chlorination and drying
2 organisms that DO NOT HAVE cyst form Dientamoeba fragilis and Trichomonas vaginalis
schizogony in protozoa binary fission or asexual reproduction in humans
sporogony in protozoa sexual reproduction, usually restricted to within insect vectors
how to dx intestinal protozoa stool O&P - using wet mount with saline or iodine or trichome staining
protozoa that stain with acid-fast agents Cryptosporidium, Isospora, Cyclospora (sporozoans)
most common protozoal infection in the US Giardia lamblia
early vs late Trypanosoma cruzi infection Chagas dz: early - parisitemia with nonfocal fever syndrome; late - aka 1-2 decades later, cardiomyopathy and arrhythmias, megacolon or esophagus
characteristics of Plasmodium on blood smear look like headphones (just as Babesia does) within the RBCs, banana-shaped gametocyte
the only helminth that multiplies within the human host Strongyloides stercoralis, means larvae can be found in stool!! (not eggs)
characteristic systemic changes that reflect parasite responses eosinophilia (characteristic of migrating worms), edema, arthralgia
pinworms (Enterobius vermicularis) infect young children and cause nocturnal anal pruritis, eggs will stick to scotch tape
Loeffler's syndrome cough, dyspnea, hemoptysis, eosinophilic pneumonitis can occur during the lung phase of larval migration; you cough up sputum and swallow it then the roundworms get to GI tract
most common helminth infection in humans roundworks (Ascaris lumbricoides)
how hookworms infect larvae in soil penetrate skin in foot perhaps, attach to intestine and eggs are in stool
Diphyllobothrium latum fresh water FISH (sushi) and perNISHous anemia
cysticercosis humans eat eggs of Taenia solium, common cause of sz in endemic areas especially in young adults
cause of swimmer's itch blood flukes or Schistosomes that invade humans accidentally; they live in fresh water. remember - worse on repeat exposure
forms Maltese crosses/tetrads, causes hemolytic anemia and is endemic to Martha's Vineyard or the East Coast Babesi microti
Created by: sirprakes



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