DEFINITIONS Infection:

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Presentation transcript:

DEFINITIONS Infection: The entry and development and multiplication of an infectious agent in the body of humans or animals. The result may be: inapparent ( asymptomatic) infection, or manifest (symptomatic) infection..

DEFINITIONS pathogenesis: pathogenicity: Production and development of disease. pathogenicity: Capability of an infectious agent to cause disease in a susceptible host.

DEFINITIONS Host: A person or other living animal which harbours a infectious agent under natural conditions . Definitive host: ( primary host) a host in which the parasite passes its sexual stage. Intermediate host: (secondary host) a host in which the parasite passes its larval or asexual stages. carrier: A person or animal that harbours a specific infectious agent in the absence of discernible clinical disease and serves as a potential source of infection.

DEFINITIONS Symbiosis: Parasitism: commensalism: interaction in which one organism lives with, in or on the body of another. Parasitism: Symbiosis in which an organism (the parasite) benefits from the association with another organism (the host) whereas the host is harmed inome way. commensalism: Kind of symbiosis in which one symbiont, the commensal, is benefited whereas the other symbiont ,the host , is neither harmed or helped by the association.

DEFINITIONS ectoparasite: parasite that lives on the outer surface of its host. endoparasite: Parasite that lives inside its host. spurious parasite: (false parasites) some free-living organisms or parasites of animals that are recovered from human feces not due to true parasitism .

DEFINITIONS autoinfection: when an infected person is his own direct cause of exposure. obligate parasite: organisms that cannot exist without a host . facultative parasite: Organisms that may live as free-living or as parasites (opportunist).

DEFINITIONS endemic: constant presence of a disease or an infectious agent within a geographic area. epidemic:The occurrence in a community or region of cases of an illness clearly in excess of expectancy. zoonosis: Disease of animals that is transmissible to humans .

CLASSIFICATION OF PARASITES PROTOZOA HELMINTHS Unicellular Single cell for all functions Multicellular Specialized cells 1:Aoebae: move by pseudopodia. 2:Flagellates: move by flagella. 3:Ciliates: move by cilia 4:Apicomplexa(Sporozoa) tissue parasites Round worms (Nematodes): - elongated, cylindrical, unsegmented. Flat worms : - Trematodes: leaf-like, - Cestodes: tape-like, segmented.

What you need to know about a parasite Scientific name (and commom name) Geographic distribution ( in general terms) Life-cycle Pathogenesis Disease(s) caused Diagnosis Treatment ( drug of choice) & prevention

Resources on Parasitology Centre for Disease Control and Prevention (CDC) : http://www.dpd.cdc.gov/DPDx/HTML/Para_Health.htm

Resources on Parasitology Centre for Disease Control and Prevention (CDC) : http://www.dpd.cdc.gov/DPDx/HTML/Para_Health.htm

Resources on Parasitology