METAZOANS (Trematodes/BLOOD FLUKES)

Question 1

Diseases caused by Schistosoma species:

Answer 1

• Schistosomiasis
• Bilharziasis
• Bilharz disease

Question 2

Acute infection caused by Schistosoma species:

Answer 2

Katayama disease

Question 3

Chronic infection caused by Schistosoma species:

Answer 3

• Ectopic granulomas (colon, liver & spleen, lungs)
• Cancer

Question 4

Most pathogenic Schistosoma species:

Answer 4

Schistosoma japonicum

• massive egg output (3000 eggs/day)
• cerebral sschostosomiasis

Question 5

Method of choice for definitive diagnosis of Schistosomiasis in the Philippines:

Answer 5

Circumoval precipitin test (COPT)

Question 6

Positive result of COPT:

Answer 6

Formation of bleb/septate precipitates

Question 7

In COPT, it takes ______ to become negative:

Answer 7

more than 2 years (>2 years) to become negative

Question 8

Other name of Schistosoma japonicum:

Answer 8

“Oriental blood fluke”

Question 9

Habitat of S. japonicum:

Answer 9

Superior mesenteric venules (Drains the Small intestine)

Question 10

Snail host of S. japonicum:

Answer 10

Oncomelania hupensis quadrasi

Question 11

Egg morphology of Schistosoma japonicum:

Answer 11

• Small lateral knob/spine
• 50-100 eggs in uterus

Question 12

Adult morphology of S. japonicum;
Female:
Male:

Answer 12

Adult morphology of S. japonicum;
Female: Central ovary
Male: Smooth tegument; 6-8 testes

Question 13

Other name of Schistosoma mansoni:

Answer 13

“Manson’s blood fluke”

Question 14

Habitat of Schistosoma mansoni:

Answer 14

Inferior mesenteric venules (Drains the large intestine)

Question 15

Snail host of Schistosoma mansoni:

Answer 15

• Biomphalaria
• Australorbis

Question 16

Egg morphology of Schistosoma mansoni:

Answer 16

• Large lateral spine
• 1-4 eggs in uterus

Question 17

Adult morphology of S. mansoni;
Female:
Male:

Answer 17

Adult morphology of S. mansoni;
Female: Ovary in anterior half
Male: Coarsely tuberculated; 8-9 testes

Question 18

Other name of Schistosoma haematobium:

Answer 18

“Vesical blood fluke”

Question 19

Habitat of Schistosoma haematobium:

Answer 19

Vesical plexus (Drains the urinary bladder)

Question 20

Snail host of Schistosoma haematobium:

Answer 20

• Bulinus
• Planorbis

Question 21

Egg morphology of S. haematobium:

Answer 21

• large terminal spine
• 20-30 eggs in uterus

Question 22

Adult morphology of Schistosoma haematobium:
Female:
Male:

Answer 22

Adult morphology of Schistosoma haematobium:
Female: Ovary in posterior half
Male: Slightly tuberculated tegument; 4-5 testes

Question 23

Egg morphology of Schistosoma mekongi:

Answer 23

Oval, minute lateral spine or knob

Note: Ova is SMALLER than japonicum

Question 24

Egg morphology of Schistosoma inetrcalatum:

Answer 24

Elongate, terminal spine

Note: Ova is LARGER than haematobium; occurs primarily in the feces

• haematobium: URINE, terminal spine
• intercalatum: STOOL/FECES, terminal spine