Evaluation of an Online Survey for Pertussis Case Investigations in Regional Queensland: Impacts on Workload and Disease Trends

In 2024, a significant pertussis surge in Queensland, Australia, strained public health resources. To improve investigation efficiency, the Wide Bay Public Health Unit introduced an online survey for pertussis cases on 1 August 2024, which collected data and provided automated health advice. This retrospective evaluation assessed survey acceptance and staff workload. A controlled interrupted time series (ITS) analysis compared pertussis incidence in the intervention region against a control group of four other de-identified regional hospital and health services in Queensland where the survey was not implemented. Of the 298 eligible cases, 140 responded (47.0%); a total of 67.9% of these required no further staff follow-up, a subgroup for whom time savings were statistically significant (<i>p</i> < 0.01). The ITS analysis for the total population revealed a significant 4.9% weekly reduction in the notification trend compared to the control group (Rate Ratio: 0.95, <i>p</i> = 0.001), with a non-significant immediate level change. The online survey is a practical and effective tool for pertussis investigation in a regional setting. It is associated with significant workload efficiencies and a favourable, statistically significant impact on community disease transmission trends.