• Endemic: the usual, expected rate of disease over time; the disease is maintained without much variation within a region
• Epidemic: occurrence of disease in excess of the expected rate; usually presents in a larger geographic span than endemics (epidemiology is the study of epidemics)
• Pandemic: worldwide epidemic
• Epidemic curve: visual description (commonly histogram) of an epidemic curve is disease cases plotted against time; classic signature of an epidemic is a “spike” in time
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