Intro to Parasitology 5.1

  1. The study of parasites and parasitism.
  2. An organism that lives on or within and at the expense of another organism (host).
  3. The state or condition of being infected or infested with parasites.
  4. Invasion by and multiplication of microorganisms in body tissue resulting in disease.
  5. Harboring of macroscopic parasites.
  6. A parasite that lives on the outer surface of the body.
  7. A parasite that lives within the body of the host.
  8. This parasites are most often associated with infestation
  9. These parasites are most often associated with infection.
  10. This is a parasite that derives benefit from the host without causing any harm.
    commensal parasite
  11. A stage of an organism's development which is resting, protective, non-motile, not capable of reproduction.
  12. State of an organism's development which is motile, vegetative, and capable of reproduction.
  13. period from initgial exposure to point which parasites or their products can be demonstrated in the feces other excretions, blood, by biopsy or other diagnostic tests.
    incubation period
  14. an organism that harbors a parasite; the organism from which the parasite obtains its nourishment.
  15. a required host in a parasitic life cycle in which essential larval development must occur before the parasite is infective to its definitive host. development occurs but adulthood is not reached.
    intermediate host.
  16. any host harboring the adult or sexually mature stage of the parasite
    definitive host
  17. animal that harbors a species of parasite that can be transmitted to and infect man.
    reservoir host
  18. the sequence of morphologic and environmental stages necessary for the survival and reproduction of parasites.
    life cycle
  19. an arthropod or other agent that carries microorganisms from one infected individual to another.
  20. what three factors affect the endemicity of parasites?
    • presence and habits of suitable host
    • easy escape
    • envronmental conditions
  21. what are four factors that affect the distribution of human parasites?
    • economic conditions
    • social conditons
    • religion
    • migration
  22. What is the geographical distribution of human parasites?
    • tropics and subtropics
    • temperate regions
  23. what are three factors involved in the transmisssion of parasites?
    • source of infection
    • mode of transmission
    • presence of a susceptible host
  24. what are the three types of parasite life cycles?
    • no intermediate host
    • one intermediate host
    • two intermediate hosts
  25. No intermediate host are transmitted from person to person by what two means?
    • contaminated food or drink
    • fecal-oral contamination
  26. one intermediate host usually use a large _______, _________ or _________.
    • mammal
    • crustacean
    • insect
  27. two intermediate host are usually from fresh water or vegetation to ___________ to _________ to man.
    • crustacean (snail)
    • fish
  28. this is the smallest parasite with a size of 4-6u by 2-3u.
    toxoplasma gondii
  29. this is the longest parasite with a size of 30 feet or longer.
    Diphyllobothrium latum
  30. This parasite has the largest ova with a size of 82u by 135u.
    Fasciolopsis species
  31. what is the most common portal of entry for parasites?
    by mouth (ingestion)
  32. this portal of entry is seen with pinworm ova.
    inhalation (airborne ova)
  33. This portal of entry intermediate fors penetrate the skin (e.g. hookworm larva).
    entry into skin or break in the skin
  34. T. vaginalis uses what protal of entry?
    sexual contact
  35. This parasite can be transmitted transplacentally.
    T. gondii
Card Set
Intro to Parasitology 5.1
Intro to Parasitology 5.1