During an epidemic, which is an epidemiologic function?

• A. Conducting assessment of suspected cases to detect the communicable diseases
• B. Monitoring the condition of the cases affected by the communicable disease
• C. Participating in the investigation to determine the source of epidemic
• D. Teaching the community on preventive measures against the disease

Answer: (C)

The essential idea is that during an epidemic the epidemiologic function focuses on tracing the outbreak to its source so transmission can be interrupted. Participating in the investigation to determine the source of the outbreak involves collecting and analyzing data on who is affected, when, and where, and then testing hypotheses about exposures to identify the most likely origin. This knowledge directly guides targeted control measures, such as removing contaminated food or water or changing environmental factors, to stop further cases.

Other activities mentioned—assessing suspected cases and monitoring the condition of those affected—are crucial parts of surveillance and case management that support the response but don’t constitute the investigative work to pinpoint the source. Teaching the community about preventive measures is health education, aimed at prevention rather than the source-detection process.