on stomach serosa of salmon (18), and plerocercoids of D.
Second intermediate hosts (freshwater fish such as bream, catfish, snake-headed fish, sleeper perch, Nile tilapia, butterfish, or eel; frogs; snakes; chickens; snails; or pigs) ingest the copepods, liberating the larvae, which encyst
in muscle and mature into L3 forms.
Human echinostome infection results from ingestion of metacercariae that encyst
in secondary intermediate hosts, usually freshwater snails, tadpoles, or fish.
They are released into the freshwater environment and attach, penetrate, and encyst
as metacercariae in susceptible second intermediate hosts.
The cercariae penetrate under the scales of a susceptible fish, which serves as the second intermediate host; they encyst
as metacercaria, mainly in the fish body muscles.
Inside the ants, most of the cercaria encyst
in the walls of the abdomen, but one or two migrate to the head and encyst
in the subesophageal ganglion, a part of the brain.
The trematode encysts
in the lamellae of gills of the intermediate fish-host and may result in significant damage of gills and depressed respiratory function at high rates of metacercarial infection (Blazer and Gratzek, 1985; McDonald et al.
We sent her on her way again with enough fenbendazole wormer to prevent the puppies in the womb from being infected by a roundworm which cleverly encysts
in the muscle of the bitch, migrating to the womb in late pregnancy.
It is acquired by eating an intermediate larval stage that emerges from snails and encysts
on aquatic vegetation.
After passing through the gut wall, the preparasitic stage then encysts
, usually in the fat body, intestinal wall, connective tissue or muscle tissue of the paratenic host (Fig.
5-9) Soon after feeding on tissue debris of fish caused by release of these exotoxins, the organism encysts
and returns to the sediment.
Neurocysticercosis develops when the larval form of the tapeworm Taenia solium encysts
in the brain inciting a surrounding inflammatory and granulomatous response.