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Volume 27, Number 12—December 2021

Evaluation of Early Warning, Alert and Response System for Ebola Virus Disease, Democratic Republic of the Congo, 2018–2020

Mory KeitaComments to Author , Héloïse Lucaccioni, Michel Kalongo Ilumbulumbu, Jonathan Polonsky, Justus Nsio-Mbeta, Gaston Tshapenda Panda, Pierre Celeste Adikey, John Kombe Ngwama, Michel Kasereka Tosalisana, Boubacar Diallo, Lorenzo Subissi, Adama Dakissaga, Iris Finci, Maria Moitinho de Almeida, Debarati Guha-Sapir, Ambrose Talisuna, Alexandre Delamou, Stephanie Dagron, Olivia Keiser, and Steve Ahuka-Mundeke
Author affiliations: Institute of Global Health, University of Geneva, Geneva, Switzerland (M. Keita, J. Polonsky, S. Dagron, O. Keiser); World Health Organization Regional Office for Africa, Brazzaville, Congo (M. Keita, A. Talisuna); European Centre for Disease Prevention and Control, Stockholm, Sweden (H. Lucaccioni, I. Finci); Ministère Provincial de la Santé, Goma, Democratic Republic of the Congo (M.K. Ilumbulumbu, M.K. Tosalisana); World Health Organization, Geneva (J. Polonsky, L. Subissi); Ministère de la Santé, Direction Générale de la Lutte contre la Maladie, Kinshasa, Democratic Republic of the Congo (J. Nsio-Mbeta, G.T. Panda, P.C. Adikey, J.K. Ngwama); Ministère de la Santé, Direction Régionale de la Sante du Plateau central, Ziniaré, Burkina Faso (A. Dakissaga); Centre for Research on Epidemiology of Disasters, Research Institute on Health and Society, Université Catholique de Louvain, Brussels, Belgium (M.M. de Almeida, D. Guha-Sapir); Africa Center of Excellence (CEA-PCMT), University Gamal Abdel Nasser, Conakry, Guinea (A. Delamou); Institut National de Recherche Biomédicale, Kinshasa (S. Ahuka-Mundeke)

Main Article

Table 3

Evaluation of EWARS alerts by source of Ebola virus disease alert and health zone, Democratic Republic of the Congo, August 5, 2018–June 30, 2020

Category % (95% CI)
Sensitivity Specificity PPV NPV
Source of alert
Active case finding/IPC 87.5 (86.9–88.1) 91.7 (91.6–91.9) 51.2 (50.4–51.9) 98.7 (98.6–98.7)
Community 91.4 (90.1–92.7) 93.6 (93.3–93.9) 48.3 (46.6–50.0) 99.4 (99.3–99.5)
Health facility 65.4 (63.8–67.0) 96.2 (96.0- 96.4) 64.5 (62.9–66.1) 96.4 (96.2–96.6)
Other surveillance sites
98.0 (97.4–98.7)
34.3 (33.0–35.6)
33.0 (31.7–34.2)
98.1 (97.5–98.8)
Health zone
Beni 94.8 (94.4–95.2) 90.6 (90.5–90.8) 44.9 (44.3–45.5) 99.5 (99.5–99.6)
Mutwanga 54.9 (52.4–57.3) 96.4 (96–96.7) 68.2 (65.7–70.8) 93.8 (93.3–94.2)
Oicha 64.3 (62.8–65.8) 93.3 (92.8–93.8) 78.6 (77.2–80.1) 87.2 (86.6–87.9)

*EWARS, Early Warning, Alert and Response System; IPC, Infection Prevention and Control; NPV, negative predictive value; PPV, positive predictive value.

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Page created: October 22, 2021
Page updated: November 19, 2021
Page reviewed: November 19, 2021
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