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This initial study can result in a) no etiologic connection, b) an etiologic connection which is already known, and c) a new possible etiologic connection. In general, for the first result, the investigation is declared over; in the second, preventive intervention to stop further exposure is instituted; and for the last option, the cluster investigation may have resulted in a new disease-toxin connection. In this latter case, the Investigator must remember that additional investigations in new locations must take place to prove the possible etiologic connection. It may also be appropriate to perform toxicologic studies. Public health intervention may be warranted even with limited scientific evidence.

Finally, communication through this process is essential for any resolution to occur.