BLOOD FLUKE: SCHISTOSOMA JAPONICUM

• Mindoro

• Leyte

• Sorsogon

• Mindanao

Common in what places in the PH?

S. japonicum

Smallest blood fluke

• Philippines

• Japan

• Far East (China, Southeast Asia)

  • This reflects where the specific snail host exists.

Geographic distribution

T

T or F
Female is longer but slimmer, and usually stays inside the male’s groove.

• Rudimentary lateral (knob-like) spine

• a small, poorly developed lateral spine

• appears like a tiny knob, not sharp or obvious

Egg morphology

Oriental Blood fluke

Common name

Man

FH

• Dogs

• cats

• carabao

• other mammals

Reservoir host

Snail:

• HabitaOncomelaria hupensis quadrasi

IH

• Superior mesenteric vein in the small intestine

Habitat

Cercaria

Infective stage

Skin penetration

MOT

• Smooth

• nontuberculated

Adult morphology: Integument

6–7 testes

No of testes

• short

• with 1–4 eggs

• Only a few eggs are present at a time (unlike species with many eggs in uterus)

• ovary is located centrally

Uterus

3000 days per day

No. of eggs per day

• Stool examination

• rectal biopsy specimen

Laboratory Diagnosis

• Katayama’s disease (snail fever)

• Oriental schistosomiasis

• Swamp fever

Enumerate: Pathology

Katayama’s disease (snail fever)

Pathology

• Acute phase of infection.

• Caused by the body’s immune reaction to migrating larvae and egg deposition

• Symptoms: fever, chills, cough, diarrhea, enlarged liver/spleen.

Oriental schistosomiasis

Pathology

• The chronic disease form in Asia.

• Eggs get trapped in tissues → inflammation and granuloma formation, especially in the liver and intestines.

Praziquantel

Treatment