TREMATODE
INTERMEDIATE
MODE OF ENTRY
SITE OF
HOST(S}
INFESTATION
Schistosoma hematobium
Penetration of skin
Blood
by free-swimming
vessels of
cercariae.
urinary
bladder
Schistosoma mansoni
Snail
Inferior
mesenteric
veins
Schistosoma japonicum
Superior
mesenteric
veins
ParaQonimus westermani
Snail-crab
Ingestion of infested
Lungs
crabmeat
Opisthorchis sinensis
Snail-fish
Ingestion of
Liver (bile
infested fish
ducts)
MetaQonimus yokegawai
Snail-fish
Ingestion of
Intestine
infested fish
Heterophves heterophyes
Snail-fish
Ingestion of
Intestine
infested fish
Fasciola hepatica*
Snail
Ingestion of encysts
Liver (bile
larvae on vegetation
ducts)
Fasciolopsis buski**
Snail
Ingestion of encysts
Intestine
larvae on vegetation
Gastrodiscoides
Snail
Ingestion of encysts
Intestine
hominis**
larvae on vegetation
*Usual definitive host is sheep, but man is sometimes affected.
**Usual definitive host is swine, but man is sometimes affected.
Table 2-9. Principal trematodes affecting man.
NOTE: Table 2-10 below refers to 2-28. Nematodes (Roundworms) found beneath
Table 2-10.
MD0151
2-37