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Volume 22, Number 2—February 2016
Letter

Accuracy of Dengue Reporting by National Surveillance System, Brazil

Monaise M.O. Silva, Moreno S. Rodrigues, Igor A.D. Paploski, Mariana Kikuti, Amelia M. Kasper, Jaqueline S. Cruz, Tássia L. Queiroz, Aline S. Tavares, Perla M. Santana, Josélio M.G. Araújo, Albert I. Ko, Mitermayer Galvão Reis, and Guilherme S. RibeiroComments to Author 
Author affiliations: Centro de Pesquisas Gonçalo Moniz, Fundação Oswaldo Cruz, Salvador, Brazil (M.M.O. Silva, M.S. Rodrigues, I.A.D. Paploski, M. Kikuti, A.M. Kasper, J.S. Cruz, T.L. Queiroz, A.S. Tavares, P.M. Santana, A.I. Ko, M.G. Reis, G.S. Ribeiro); nstituto de Saúde Coletiva, Universidade Federal da Bahia, Salvador (M.M.O Silva, I.A.D. Paploski, M. Kikuti, T.L. Queiroz, G.S. Ribeiro); Universidade Federal do Rio Grande do Norte, Natal, Brazil (J.M.G. Araújo); Yale University School of Public Health, New Haven, Connecticut, USA (A.I. Ko, M.G. Reis, G.S. Ribeiro); Faculdade de Medicina, Universidade Federal da Bahia, Salvador (M.G. Reis)

Main Article

Table

Accuracy of a national surveillance system for recording cases of suspected dengue among patients with acute febrile illness who visited an emergency health unit of Salvador, Brazil, January 1, 2009–December 31, 2011*

Notification status of AFI patients†
Laboratory status of AFI patients, no.‡
Dengue prevalence, %§
% (95% CI)
MF¶
Dengue
Nondengue AFI
SENS
SPEC
PPV
NPV
Overall
Reported 57 26 25.8 5.7
(4.4–7.3) 99.1
(98.7–99.4) 68.7
(58.1–77.6) 75.1
(73.7–76.5) 12.0
Not reported
940
2,841
Study year
2009
Reported 4 4 10.3 3.3
(1.3–8.3) 99.6
(99.0–99.9) 50.0
(21.5–78.5) 90.0
(88.1- 91.6) 15.0
Not reported 116 1,039
2010
Reported 27 8 33.8 6.0
(4.1–8.6) 99.1
(98.2–99.5) 77.1
(61.0–87.9) 67.4
(64.8- 69.9) 12.9
Not reported 423 873
2011
Reported 26 14 31.2 6.1
(4.2–8.8) 98.5
(97.5–99.1) 65.0
(49.5–77.9) 69.9
(67.3- 72.3) 10.7
Not reported
401
929
Age group, y
5–14
Reported 23 15 25.5 5.8
(3.9–8.6) 98.7
(97.9–99.2) 60.5
(44.7–74.4) 75.4
(73.2–77.5) 10.4
Not reported 372 1,139
≥15
Reported 34 11 26.0 5.6
(4.0–7.8) 99.4
(98.9–99.6) 75.6
(61.3–85.8) 75.0
(73.2–76.7) 13.8
Not reported
568
1,702
Monthly dengue prevalence§
≥20%
Reported 52 18 38.1 6.7
(5.2–8.7) 98.6
(97.7–99.1) 74.3
(63.0–83.1) 63.1
(61.0–65.2) 11.1
Not reported 722 1,235
<20%
Reported 5 8 12.1 2.2
(1.0–5.2) 99.5
(99.0–99.8) 38.5
(17.7–64.5) 88.0
(86.5–89.5) 17.2
Not reported 218 1,606

*AFI, acute febrile illness; SINAN, Sistema de Informação de Agravos de Notificação (Notifiable Diseases Information System, Brazil); SENS, sensitivity; SPEC, specificity; PPV, positive predictive value; NPV, negative predictive value; MF, multiplication factor.
†Notification status of the AFI patients was ascertained from the SINAN database on reported dengue cases for the city of Salvador. SINAN database was obtained from the Salvador Secretary of Health in January 2013.
‡Acute-phase serum samples from AFI patients were systematically tested for dengue by nonstructural protein 1 ELISA and IgM ELISA; convalescent-phase serum samples were also tested by IgM ELISA.
§Among AFI patients assisted at the sentinel surveillance emergency unit.
¶Laboratory-confirmed dengue/AFI patients reported as having a suspected case of dengue.

Main Article

Page created: January 18, 2016
Page updated: January 18, 2016
Page reviewed: January 18, 2016
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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