Epi-X case-seeking reports were considered at least moderately successful in 23 of 30 reports for which feedback was elicited. In some instances, investigators expected to find no other related cases but posted their reports to make sure they had been thorough. Some investigators regarded their report(s) as successful, despite not finding any additional cases. Investigators may become more confident that all related cases have already been identified if they do not find additional cases as a result of posting on Epi-X.