Schistosoma

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Schistosoma

• haematobium, intercalatum, japonicum, mansoni

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Schistosomiasis or Bilharziasis

• Intestinal and urinary schistosomiasis.
• Snail-mediated snails living on waterplants.
• Water contaminated by faeces or urine.

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Bulinus (Physopsis) africanus

• This snail is the intermediate host of
  Schistosoma haematobium in Congo (Mayumbe, 1972).

1 cm
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Biomphalaria (Planorbis) camerounensis

• This snail is the intermediate host of
  Schistosoma mansoni in Congo (Mayumbe, 1972).

1 cm
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Cercaria S. mansoni
Courtesy CDC
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Schistosoma haematobium

• Egg, red and white blood cells in urinary
  sediment. Note the small terminal spine and the
  mature miracidium. Very large egg 150 ?m
  (unstained).

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Schistosoma haematobium

• Egg in urinary sediment. Note the small terminal
  spine and the mature miracidium. Very large egg
  150 ?m (unstained).

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Schistosoma intercalatum

• Egg in faeces. Very elongated egg with a
  prominent terminal spine. Very large egg 140 to
  240 ?m (unstained).

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Schistosoma japonicum

• Egg in stool. The shape is round to ovoid. The
  shell shows a light depression with a small spine
  in the form of a hooklet. Length 70 to 100 ?m
  (unstained).

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Schistosoma japonicum

• Schistosoma japonicum egg, and its vestigial
  spine (arrow) taken from a liver tissue biopsy.

Courtesy CDC
12
Schistosoma mansoni

• Egg in stool, with a typical large lateral spine
  and a miracidium. Very large egg 150 ?m
  (unstained).

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Katayama fever

• Acute schistosomiasis.
• In uninfected persons 2-8 weeks after exposure to
  S. japonicum or (S. mansoni).
• Fever and several other symptoms during a few
  weeks death may occur with heavy infections.
• Eosinophilia.
• Maguire J.H. 2005.

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Swimmers itch or Schistosomal dermatitis
(cercarial dermatitis, clam diggers itch)

• Due to cercaria of avian schistosmes (commonly
  Trichobilharzia).
• Cercaria in the skin (almost limited to the
  skin).
• Freshwater lakes of the northern US many areas
  of the world. Saltwater (clam diggers itch).
• No specific anthelmintic therapy.
• Nash T.E. 2005. In Mandell et al.

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