haematobium intercalatum japonicum mansoni · this snail is the intermediate host of schistosoma...
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Schistosoma
haematobium, intercalatum,japonicum, mansoni
Schistosomiasis or Bilharziasis
• Intestinal and urinary schistosomiasis.• Snail-mediated: snails living on waterplants.• Water contaminated by faeces or urine.
Courtesy Peters W. & Gilles H.M.Courtesy Peters W. & Gilles H.M.
Bulinus (Physopsis) africanus This snail is the intermediate host of Schistosoma
haematobium in Congo (Mayumbe, 1972).
1 cm
Biomphalaria (Planorbis) camerounensis
This snail is the intermediate host of Schistosoma mansoni in Congo (Mayumbe, 1972).
1 cm
Courtesy CDC
Cercaria S. mansoni
Schistosoma haematobium Egg, red and white blood cells in urinary sediment.
Note the small terminal spine and the mature miracidium. Very large egg: 150 μm (Unstained).
Schistosoma haematobium Egg in urinary sediment. Note the small terminal spine
and the mature miracidium. Very large egg: 150 μm (Unstained).
Schistosoma intercalatum Egg in faeces. Very elongated egg with a prominent
terminal spine. Very large egg: 140 to 240 μm (Unstained).
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 μm (Unstained).
Schistosoma japonicumSchistosoma japonicum egg, and its vestigial spine
(arrow) taken from a liver tissue biopsy.
Courtesy CDC
Schistosoma mansoni Very large egg (about 150 μm ) in stool, with a typical
lateral spine and a miracidium (Unstained).
Schistosoma mansoni Very large egg (about 150 μm) in stool, with a typical
lateral spine and a miracidium (Unstained).
Schistosoma mansoni Very large egg in stool, with a typical spine, less
visible because it is not fully in lateral position (Unstained).
Katayama syndrome
• 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. 2010.
Swimmer’s itch or Schistosomal dermatitis (cercarial dermatitis, clam
digger’s 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 digger’s itch).• No specific anthelmintic therapy.
Nash T.E. 2010. In Mandell et al.