Medical Parasitology

Medical Parasitology
Obligate Parasites
ANSWER Must spend at least some of their life cycle on or in a host


Facultative Parasites
ANSWER Normally are free-living, but CAN obtain nutrients from a host


Permanent parasites
ANSWER Remain in or on their host once they've invaded it (ie tapeworm)


Temporary parasites
ANSWER Feed on, then leave their hosts (ie biting insects)


Accidental parasites
ANSWER Invade an organism other than their normal host (ie ticks)


Hyeprparasitism
ANSWER a parasite that has parasites


Vector
ANSWER Agents of transmission of many human parasitic diseases (can be an organism)


Biological Vector
ANSWER A vector where the parasite goes through part of its life cycle using it as a host
(malaria mosquito is both a host and a biological vector)


Mechanical Vector

, ANSWER A vector that the parasite doesn't share any part of its life cycle with (ie flies that
carry parasite eggs, bacteria, or viruses from feces to food)


Definitive Host
ANSWER Harbors a parasite while it reproduces sexually


Intermediate Host
ANSWER Harbors a parasite during some other developmental stages


For the malaria parasite, the mosquito is the ___(a)___ host and the human is the __(b)__ host.
ANSWER (a). Definitive
(b). Intermediate


Reservoir Hosts
ANSWER Infected organisms enabling parasites to be transmitted to another host


Giardia intestinalis:
Location, Mode of Transmission & Disease
ANSWER *Intestines
*Ingestion of cysts in food or water
*Giardiasis


T. cruzi:
Location, Mode of Transmission & Disease
ANSWER *Blood & Tissue
*Reduviid Bug
*Trypanosomiasis- 'Chagas Disease'