Which statement about line lists is true?

• A. They contain only the patient's name
• B. They organize case data for trend detection
• C. They are used to replace laboratory confirmation
• D. They are optional in all investigations

Answer: (B)

Line lists organize case data for trend detection by turning scattered case notes into a structured table, so investigators can see patterns over time, place, and person. They typically include fields like date of onset, location, age or demographic details, symptoms, exposure history, and lab status. This organization makes it easy to visualize patterns, generate epidemic curves, and identify clusters or shifts in the outbreak, which guides response actions. They do not replace laboratory confirmation, since lab results are still needed to confirm each case. And they are not optional in most investigations—having a line list is a fundamental step for systematically summarizing who is affected and when.