Prab at 12:52, 18 March 2025

2025-03-18T12:52:59Z

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Prab: CSV import

2025-02-04T06:41:37Z

CSV import

← Older revision		Revision as of 06:41, 4 February 2025
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Tpr at 18:13, 30 September 2021

2021-09-30T18:13:20Z

New page

In some common-source outbreaks, case-patients may have been exposed over a period of days, weeks, or longer. The epidemic curve of an intermittent common-source outbreak often has a pattern reflecting the intermittent nature of the exposure.

==common-source outbreak==
A common-source outbreak is one in which a group of persons are all exposed to an infectious agent or a toxin from the same source.

==continuous common-source outbreak==
In a continuous common-source outbreak, the range of exposures and range of incubation periods tend to flatten and widen the peaks of the epidemic curve.

==point-source outbreak==
If the group is exposed over a relatively brief period, so that everyone who becomes ill does so within one incubation period, then the common-source outbreak is further classified as a point-source outbreak.

===Examples===
* The epidemic of [[leukemia]] cases in [[Hiroshima]] following the [[atomic bomb blast]] and the epidemic of [[hepatitis A]] among patrons of the Pennsylvania restaurant who ate green onions each had a point source of exposure.
* If the number of cases during an epidemic were plotted over time, the resulting graph, called an epidemic curve, would typically have a steep upslope and a more gradual downslope (a so-called “log-normal distribution”).
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{{Public health}}
{{Occupational safety and health}}
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[[Category:Epidemiology]]
[[Category:Medical hygiene]]
[[Category:Infectious diseases]]

Intermittent common source spread - Revision history

Prab at 12:52, 18 March 2025

Prab: CSV import

Tpr at 18:13, 30 September 2021