Bailey & Scott's Diagnostic Microbiology: Blood Trematodes Flashcards


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1

blood flukes

adult schistosomes not flattened; males 1.5 cm and wider than female, females 2 cm in length and thin; oral sucker surrounds mouth; ventral sucker below oral sucker; adult worms live in veins that supply intestines or bladder depending on species; eggs passed in feces or urine

2

Schistosoma haematobium

common in Africa and Arabian peninsula; found in vessels surrounding bladder in humans; mostly asymptomatic; blood in urine, painful urination, tissue granulomas, associated with bladder cancer

3

Schistosoma japonicum

common in China, Indonesia, and Phillipines; RH-domestic animals; oriental blood fluke found in vessels in small intestine in humans; causes Katayama and Tangtze River fever

4

Schistosoma mekongi

common in lower Mekong River basin (Laos), SE Asia; RH-dogs and pigs; found in vessels in small intestine of humans

5

Schistosoma mansoni

common in Africa, Arabian peninsula, and Brazil; rodents and marsupials are reservoir hosts; found in vessels in lower intestine of humans; causes swamp fever, intestinal schistosomiasis, abdominal pain, splenomegaly, hepatic or pulmonary cirrhosis

6

Schistosoma intercalatum/guineensis

common in Central and Western Africa; RH-rodents, marsupials, and nonhuman primates; found in vessels in rectum and sigmoid colon in animals

7

Schistosoma spp.

transmission occurs by penetration of intact skin by cercariae

8

Schistosoma spp. clinical presentation

cercariae cause localized swelling and itching at site of entry, enter blood causing allergic symptoms, fever, EOS, abdominal pain, and hepatosplenomegaly; jaundice with hepatitis-like syndrome; larval migration causes fever and malaise; severe tissue damage when eggs reach intestine and bladder; can cause swimmer's itch in humans

9

Schistosoma spp. lab diagnosis

eggs are detected in feces or rectal, urinary, or bladder biopsy, wet mounts, and some antibody-based assays available

10

Schistosoma haematobium lab diagnosis

eggs in urine 110-170 by 40-70 um; light yellow-brown, conspicuous terminal spine, no operculum, embryonated

11

Schistosoma mansoni lab diagnosis

eggs from stool 114-180 by 45-70 um elongated with large lateral spine, light yellow-brown, adults in large intestine venules;

12

Schistosoma japonicum lab diagnosis

eggs in stool 70-100 by 55-65 um spherical, very small lateral spine; venules of small intestines