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 Type B outbreaks are often associated with commercial distribution of food products. Examples of type B outbreaks include the recent E. coli O157 outbreaks in the west coast, the 1985 milkborne outbreak of salmonellosis in the midwest and the 1993 outbreak of waterborne cryptosporidiosis in Wisconsin. These outbreaks are almost always detected through surveillance activities.
    The exposed population is not known and the list of potential sources may be extensive. These investigations generally involve case control studies. Methodologic concerns include the inclusion of non-outbreak associated cases and proper selection of control groups. The etiologic agent is generally known.

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