An employee vaccination rate is an example of what type of surveillance data?

• A. Outcome
• B. Process
• C. Structure
• D. Event

Answer: (D)

When you think about surveillance data in terms of events, you’re focusing on counting specific occurrences over time in a defined population. An employee vaccination is one such occurrence—the immunization event. Recording how many employees are vaccinated (and calculating a rate) tracks how often that event happens, making it event data. This differs from structure data, which would look at resources like vaccine clinics or staffing; from process data, which would examine the steps taken to offer or administer vaccines; and from outcome data, which would measure health results after vaccination, such as infection rates. So, tracking the vaccination events themselves and their frequency across the workforce fits the event data category.