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DEFINITIONS

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: Production and development of disease .

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DEFINITIONS

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  1. 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..

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

  3. 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 sexualstage. • 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.

  4. DEFINITIONS • Symbiosis: • 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.

  5. 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 .

  6. 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).

  7. 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 .

  8. CLASSIFICATION OF PARASITES

  9. 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

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

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

  12. Resources on Parasitology

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