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Identifying Multiple Possible Outbreak Sources

Last modified at 9/14/2011 11:41 AM by CeRC

The following histogram shows that, in an epidemic of hepatitis A in Ibiza, Spain, in 2001, three groups of cases were identified. The epidemic curve can be devised into 3 subgroups (restaurant attendants, customers of shop-B, and hotel C residents). Subsequently, detailed investigation and case control studies could have been conducted to identify vehicles and risk factors specific to each subgroup.

Source: Instituto Carlos III, Madrid, Spain