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##*This factor is the most important in that it identifies the source of exposure. It may be a germ, toxin or gene.
##Reinforcing factors
##*These are factors that compound the likelihood of getting a disease. They may include repeated exposure or excessive [[Stress (biology)|environmental stresses]].
#Look for patterns and trends
#*Here one looks for similarities in the cases which may identify major risk factors for contracting the disease. [[Outbreak#Types|Epidemic curves]] may be used to identify such risk factors.
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