Evolution of a Disease Surveillance System: An Increase in Reporting of Human Monkeypox Disease in the Democratic Republic of the Congo, 2001-2013
Nicole A. Hoff, Reena H. Doshi, Brian Colwell, Benoit Kebela-Illunga, Patrick Mukadi, Mathias Mossoko, D’Andre Spencer, Jean-Jacque Muyembe-Tamfum, Emile Okitolonda-Wemakoy, Jamie Lloyd-Smith, Anne W. Rimoin
International Journal of TROPICAL DISEASE & Health · pp. 1–10 · Published 28 Aug 2017
10.9734/IJTDH/2017/35885Abstract
Objective: Evaluating the effectiveness of a surveillance system, and how it improves over time has significant implications for disease control and prevention. In the Democratic Republic of Congo (DRC), the Integrated Disease Surveillance and Response (IDSR) was implemented to estimate the burden of disease, monitor changes in disease occurrence, and inform resource allocation. For this effort we utilized national passive surveillance data from DRC’s IDSR to explore reporting trends of human monkeypox (MPX) from 2001 to 2013. Methods: We obtained surveillance data on MPX cases occurring between January 2001 and December 2013 from the DRC Ministry of Health (MoH). Phases of the surveillance system, yearly trends in reporting and estimated incidence for MPX were analyzed using SAS v9.2 and Health Mapper. Results: Between 2001 and 2013, three discrete surveillance phases were identified that described the evolution of the surveillance system. Overall, an increase in suspected MPX cases was reported, beyond what would be expected from simply an improved reporting system. When restricting the analysis to the “stable phase,” national estimated incidence increased from 2.13 per 100,000 in 2008 to 2.84 per 100,000 in 2013. Conclusions: The reported increase in MPX, based on an evolving surveillance system, is likely to be a true increase in disease occurrence rather than simply improvements to the surveillance system. Further analyses should provide critical information for improved prevention and control strategies and highlight areas of improvement for future data collection efforts.
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