PARASITOLOGY Flashcards
living together of phylogenetically different organisms
Symbiosis
beneficial to both organisms (++)
Mutualism
beneficial to one, neutral to the other (+0)
Commensalism
beneficial to one, parasitic to the other (+-)
Parasitism
adult of sexual stage of the parasite
Definitive Host
larval or asexual stage of the parasite
Intermediate Host
parasite does not develop, but remains alive and is infective to the next host
Paratenic Host
allows parasite’s life cycle to develop or continue, and serve as source of human infection
Reservoir Host
depends entirely for host existence
Obligate Parasite
parasitic and free living existence
Facultative Parasite
larval stage passed in a host, and adult stage is free living
Transitory Parasite (Homoxenous)
completes its cycle in 1 host (H. nana)
Permanent Parasite (Homoxenous)
requires 2 or more hosts for larval and adult stages
Periodic Parasite (Heteroxenous)
primarily infects animals and may be acquired by man
Zoonotic Parasite
occurs in unusual host
Accidental Parasite
occurs in unusual organ (A. lumbricoides)
Erratic Parasite
passes through intestinal tract without causing any disturbance (usually ingested eggs)
Spurious Parasite
Infection - lives inside the hosts body
Endoparasite Infection - lives inside the hosts body
infestation - lives in body surfaces
Ectoparasite
visits the host during feeding time
Intermittent Parasite
transmits a parasite after latter has completed part of its development
Ex: mosquitoes, biting flies, kissing bugs, ticks
Biologic Vector
responsible only for transporting the parasite via its appendages
Ex: cockroaches, house flies
Mechanical/Phoretic Vector
mouth/oral cavity, skin, urogenital tract, nasal passages, transplacental mode of transmission
Portal of Entry
anus, mouth, urogenital tract, non-intact skin
Portal of Exit
