 this database can be used for tracking summary data for responses activities it is not intended to capture individual case data as would be done with a line list or a database developed for a specific epidemiologic investigation see corhas standard variables list for help with that topic maintaining an electronic database of hai ar investigations allows a health department or healthcare system to review and summarize information to facilitate information sharing and identify strengths and gaps in reporting and investigative capacity consider recording all hai ar response activities in your tracking system response refers to efforts to assist with the assessment and investigation of specific acute hai ar risks which may take the form of 1 outbreaks 2 clusters of infections 3 sentinel cases e g hai or emerging ar threat of public health interest or 4 a serious breach in infection control practice 