Blood Trematodes

Question 1

Blood trematodes are under the genus _

Answer 1

Schistosoma

Question 2

Diseases caused by Blood trematodes

Answer 2

Schistosomiasis / Bilharziasis / snail fever

Question 3

Known as the oriental blood fluke

Answer 3

Schistosoma japonicum

Question 4

Difference of schistosomes from other trematodes in the sexual stage

Answer 4

Schistosomes are not hermaphroditic. They have separate sexes

Question 5

Blood trematodes that supply in the veins of the intestine

Answer 5

S. japonicum & S. mansoni

Question 6

Blood trematodes that supply the veins of the urinary bladder

Answer 6

S. haematobium

Question 7

Eggs from schistosoma trematodes are passed in

a. feces
b. urine
c. neither
d. both

Answer 7

d. Both feces and urine.

> urine (S. haematobium); feces (S. japonicum & mansoni)

Question 8

Distinctive feature of Schistosoma from other species

Answer 8

Spine (sharply pointed terminal spine) to penetrate the vein

Question 9

Adult location of S. mansoni vs S. japnicum

Answer 9

S. japonicum - small intestine

S. mansoni - large intestine

Question 10

Resembles the egg of S. haematobium but is acid fast positive

Answer 10

S. intercalatum & guineensis

Question 11

Resembles the egg of S. mansoni but smaller

Answer 11

S. mekongi

Question 12

All eggs of Schistosoma are _

Answer 12

Unoperculated & embryonated

Question 13

Identify:

Pointed terminal spine, unoperculated, embryonated

Answer 13

S. haematobium

Question 14

Identify:

Small lateral spine, unoperculated, embryonated

Answer 14

S. japonicum

Question 15

Identify:

Large lateral spine, unoperculated, embryonated

Answer 15

S. mansoni

Question 16

Intestinal schistosomes have a _ spine

Answer 16

Lateral

Question 17

Gold standard for the diagnosis of schistosomes

Answer 17

Detection of eggs in feces and urine / rectal biopsy

Question 18

To optimize recovery of S. haematobium in urine, the specimen should be collected between _

Answer 18

Noon (midday) to 2pm

Question 19

An 18 y/o male had recently been on 1 month long trip to Brazil with a group of volunteer workers. He complained of crampy abdominal pain, and twice noticed a small amt. of blood in his feces. Microscopic detection showed a large, unoperculated oval egg with large lateral spine. What is the parasite?

Answer 19

S. mansoni