Acanthocephalan parasites can manipulate the behavior of gammarids in a way that appears to increase their probability of being preyed upon by their definitive hosts
(Lagrue et al.
Observations in experimentally infected definitive hosts
Logistic regression, combined with other observations or data, may be a useful method for the prediction of intermediate and/or paratenic hosts of poorly known parasites when the definitive host
has had ample dietary analysis performed.
There may be more than one definitive host
as is the case with Dipylidium caninum, the dog tapeworm, which can have a definitive host
of a dog, cat, or human.
Much of the literature on snails that serve as hosts for trematode parasites is in the form of life cycle descriptions for the definitive hosts
of the parasites.
microti shares the same vector tick (Ixodes scapularis), reservoir rodent (the white-footed mouse), and definitive host
(the white-tailed deer) as Borrelia burgdorferi, the Lyme disease spirochete, the pathogens are unrelated and treatment for the two conditions differs.
The two infections share the same vector tick (Ixodes scapularis), reservoir rodent (the white-footed mouse), and definitive host
(the white-tailed deer).
Another parasite under suspicion for otter deaths is Sarcocystis neurona, whose only definitive host
is the opossum.
The predominant definitive host
for D immitis is a canine, but other mammals, such as cats, foxes, and muskrats, may be infected.
neurona that the opossum (Dideiphis virginiana) is a definitive host
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The heron Butorides striatus is the only known natural definitive host