Parasitology Intro Terminology

  1. Parasitism
    A close association (symbiosis) between two different species of organisms, one of which, the Parasite, depends on the other, the Host, deriving some benefit from it without necessarily damaging it
  2. Life Cycle
    The course of developmental changes through which an organism passes from its inception as a fertilized zygote to the mature state in which another zygote may be produced
  3. Direct Life Cycle
    A parasite is transmitted directly from on definitive host to the next without an intermediate host
  4. Indirect Life Cycle
    An intermediate host is required for the transmission of a parasite form one definitive host to the next (two type of host involved)
  5. Definitive Host
    The host in which the parasite reaches maturity and undergoes SEXUAL REPRODUCTION ( can be vertebrate or invertebrate)
  6. Intermediate Host
    Ordinarily, a necessary host and one in which only the asexual or immature states occur (can be vertebrate or invertebrate)
  7. Reservoir Host
    An infected animal serving as a source from which other animals can become infected
  8. Paratenic Host
    A POTENTIAL host (does not have to be) in which there is NO REQUIRED development of the immature parasite but the organism remains infective for the definitive host (also called a transport host)
  9. Accidental Host
    Parasite in unusual or abnormal host (also called incidental or aberrant host)
  10. Infection
    the presence of parasites within a host
  11. Prepatent period
    time during which developmental stages of parasites have not been produced to give evidence (such as eggs/oocysts) of their presence
  12. Patent Period
    point at which infectious/ parasitic agent produced evidence (such as eggs, larvae, or oocysts) of their presence
  13. Disease
    a specific morbid process that has a characteristic set of signs; may affect either the entire body or any part of the body
  14. Clinical disease
    Can measure the signs
  15. Subclinical Disease
    Cannot measure the signs of disease/ does not have any signs of disease
  16. Pathogenicity
    • The ability to cause disease:
    • Number of parasites
    • Strain or spp. of parasites
    • Host immune status
  17. Infestation
    Invasion by parasites (generally restricted to ectoparasites) Outside the body
  18. Infected
    The parasites are inside the body
Card Set
Parasitology Intro Terminology
Parasitology introduction/ definitions