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Thursday, March 12, 2009

article : Host-Parasite Interaction Basic Definitions


INDEPENDENCE:
living free from the influence, guidance, or control by another organism


SYMBIOSIS:
a relationship in which two dissimilar organisms (SYMBIOTES, SYMBIONTS) live in close association with one another


MUTUALISM:
mutually beneficial relationship between two species


COMMENSALISM:
a relationship between two species in which one is benefited and the other is not affected, neither negatively nor positively


PARASITISM:
a relationship between two species in which one benefits (parasite) from the other (host); usually involves some detriment to the host


BENIGN:
referring to a non-life or non-health threatening condition = COMMENSALISM


MALIGNANT:
a disease tending to become progressively worse (MORBIDITY=illness) and potentially result in death (MORTALITY=death)


CARRIER:
a symptomless individual who is host to a pathogenic microorganims and who has the potential to pass the pathogen to others


PATHOGENICITY:
the quality of producing or the ability to produce pathologic changes or disease


VIRULENCE:
a measure of pathogenicity; a measurement of the degree of disease producing ability of a microorganism as indicated by the severity of the disease produced; a measure of the dosage required to caused a specific degree of pathogenicity --- one general standard is the LD50


DOSAGE:

the number of pathogenic microorganisms entering the host


LD50:
the number of microorganisms required to cause lethality in 50% of the test host


TRUE PATHOGEN:
any microorganism capable of causing disease; an infecting agent


OPPORTUNISTIC PATHOGEN:
a usually harmless microorganism that becomes pathogenic under favorable conditions


INFECTION:
the colonization and/or invasion and multiplication of pathogenic microrganisms in the host with or without the manifestation of disease


COLONIZATION:
the successful occupation of a new habitat by a species not normally found in this niche


MULTIPLICATION:
the ability of a microorganism to reproduce during an infection


DISEASE:
an abnormal condition of body function(s) or structure that is considered to be harmful to the affected individual (host); any deviation from or interruption of the normal structure or function of any part, organ, or system of the body
Designed & Maintained by David M. Rollins
Copyright © 2000, D.M. Rollins and S.W. Joseph
Revised: September 2003
URL: http://life.umd.edu

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