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In epidemiology, an outbreak is a sudden increase in occurrences of a disease when cases are in excess of normal expectancy for the location or season. It may affect a small and localized group or impact upon thousands of people across an entire continent.
Outbreak carries the same definition of epidemic, but is often used for a more limited geographic area. Cluster refers to an aggregation of cases grouped in place and time that are suspected to be greater than the number expected, even though the expected number may not be known.
Jul 28, 2009 · Generally outbreak means a “sudden occurrence,” while in the epidemiological sense an outbreak is defined as a sudden increase in the disease frequency, related to time, place, and observed population.
Oct 31, 2014 · It is common practice to define outbreaks as the occurrence of cases of disease at a frequency greater than expected. 1 When an outbreak occurs, it is necessary to define the population at risk (i.e., the denominator) if an accurate measure of the rate of disease is to be calculated.
An outbreak is defined as more cases of a disease than expected in a specific location over a specific time period. Suspicion often arises when health care workers report an unusual cluster or a single, unexpected presentation. This passive surveillance leads to a delay in the detection of an outbreak.
Feb 16, 2024 · February 16, 2024. Introduction to Epidemiology. At a glance. This course provides an overview of epidemiology, including key terms, sources of data, and study design. Learners will calculate different rates of disease and go through the steps an epidemiologist takes to investigate a disease outbreak. Learning Objectives.
Two or more cases of disease linked to the same source. What is an waterborne outbreak? - WHO definition. At least two people experience a similar illness after exposure to water and the evidence suggests a probable water source. (Large water supply) waterborne outbreaks. Associated with watershed events:
