The present report provides important new information on the prevalence of asexuality among tetrathyridia and underscores the need for further study of this variation among metacestodes
of this cosmopolitan genus.
may also develop in humans, causing various forms of echinococcosis.
Efficacy of meat inspection will differ from the number and location of incisions, easily leading to missing T solium metacestode
villosum (body cavity), the metacestode
Nybelinia surmenicola (stomach wall), the digenean metacercaria Otodistomum sp.
The Caloosahatchee oysters also had metacestode
infections at all sites and some, especially the higher salinity sites at Tarpon Bay and Gregs Reef, had prevalences of up to 90%.
Encysted taeniid metacestodes
can remain dormant for years before asexual multiplication (13); thus, this animal could have become infected at virtually any point in its life.
In contrast, the metacestode
found in the nutria and in the Panamanian patient described in 1965 was shown to be E.
tissue either by examining morphologic features or by DNA detection by using modified PCR (28).
Human alveolar echinococcosis, caused by the metacestode
of the fox tapeworm Echinococcus multilocularis, is considered to be the most pathogenic zoonosis in temperate and arctic regions of the Northern Hemisphere.
The life cycle of this tapeworm is indirect and sylvatic; eggs shed by the definitive host, mainly the Red Fox (Vulpes vulpes) in Europe, develop to the metacestode
stage in arvicolid rodents, which serve as intermediate hosts.
Liver parts were preserved in 70% ethanol and 4% buffered paraformaldehyde after microscopy examination to detect metacestode
of moose, Alces alces, of the Chapleau Crown Preserve, Ontario.