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Disease
an abnormal condition of an organism which interrupts the normal bodily functions
Pathogen
biological agents that cause disease (some are living, some are non-living)
Sign
can be detected (seen) or measured by another individual
Symptom
can be detected (seen) or measured by another individual
Prevention
inhibiting the introduction of a disease into an area, population or individual
Treatment
the use of an agent or procedure (such as a drug or surgery) in an attempt to cure or mitigate a disease condition
Epidemic
the occurrence of more cases of a disease than would be expected in a community, country or region during a given period
Contrast infectious and non-infectious diseases
Infectious diseases are caused by pathogens whereas non-infectious diseases are not caused by pathogens.
Recall the following modes of disease transmission
Food-borne
Water-borne
Insect-borne
Direct contact
Sexually transmitted disease
Bioaccumulation
gradual accumulation of pollutants etc. through the lifetime of an individual
Biomagnification
increase in the concentration of a pollutant from one trophic level to the next
