definitive host

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Related to definitive hosts: intermediate host, Secondary host

definitive host

[də′fin·əd·iv ′hōst]
(biology)
The host in which a parasite reproduces sexually.
References in periodicals archive ?
Life cycle strategies of flukes using these two species of frogs as definitive hosts (Figs.
Because marine mammals serve as definitive hosts, the life cycle is undoubtedly completed in the sea, unlike the freshwater cycle of most other human-infecting diphyllobothriids (2).
To investigate the presence of Sarcocystis species in definitive hosts, 6 opossums (D albiventris) living in areas near the park were captured, humanely euthanatized, and submitted for necropsy.
Its definitive host is still unknown but earlier phylogenetic analysis suggests that snakes could be a probable definitive host (9).
Although removal of this parasite from domestic dogs and cats is effective, eradication from free-ranging definitive hosts may be unfeasible (2,12).
nematodes in definitive hosts is in accordance with previous observations in areas in Italy to which Thelazia spp.
The fact that general patterns of prevalence in the Pantanal did not differ between host species, and were similar for both genders in coatis and crab-eating foxes may indicate that differences in features such as body size and social behavior are relatively less important for predicting infection rates by acanthocephalans when compared to the availability and consumption rates of infected intermediate hosts by definitive hosts. Parasites loads, in turn, may shaped more by features related to host health and immune system function, which are in turn potentially affected by host age and gender.
Wild canids (e.g., foxes and coyotes), dogs, and (less commonly) cats act as definitive hosts, which harbor adult parasites in the small intestine without apparent clinical disease.
According to the phylogenetic and ecologic data, birds of prey, mostly the western marsh harrier (Circus aeruginosus) and the white-tailed eagle (Haliaeetus albicilla), are presumed to be definitive hosts of S.
Consequently, they exhibit higher levels of mortality in these conditions than definitive hosts. In addition, trematode infection sterilises host snails, and is often associated with greater mortality in infected individuals.
granulosus lives in the intestine of dogs, which are the definitive hosts. Eggs are passed with faeces by dogs, and are ingested by intermediate hosts (usually sheep, goats, swine, cattle, horses and camels); the eggs hatch in the small bowel and release oncospheres that penetrate the intestinal wall and migrate through the circulatory system into various organs, especially the liver and lungs.