Evaluation of a Spotted Fever Group Rickettsia Public Health Surveillance System in Tennessee

Mary-Margaret A. Fill Epidemic Intelligence Service, Division of Scientific Education and Professional Development, Centers for Disease Control and Prevention, Atlanta, Georgia
Division of Communicable and Environmental Diseases and Emergency Preparedness, Tennessee Department of Health, Nashville, Tennessee

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Abelardo C. Moncayo Division of Communicable and Environmental Diseases and Emergency Preparedness, Tennessee Department of Health, Nashville, Tennessee

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Karen C. Bloch Division of Infectious Diseases, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
Department of Health Policy, Vanderbilt University Medical Center, Nashville, Tennessee

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John R. Dunn Division of Communicable and Environmental Diseases and Emergency Preparedness, Tennessee Department of Health, Nashville, Tennessee

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William Schaffner Department of Health Policy, Vanderbilt University Medical Center, Nashville, Tennessee

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Timothy F. Jones Division of Communicable and Environmental Diseases and Emergency Preparedness, Tennessee Department of Health, Nashville, Tennessee

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Spotted fever group (SFG) rickettsioses are endemic in Tennessee, with ∼2,500 cases reported during 2000–2012. Because of this substantial burden of disease, we performed a three-part evaluation of Tennessee's routine surveillance for SFG rickettsioses cases and deaths to assess the system's effectiveness. Tennessee Department of Health (TDH) SFG rickettsioses surveillance records were matched to three patient series: 1) patients with positive serologic specimens from a commercial reference laboratory during 2010–2011, 2) tertiary medical center patients with positive serologic tests during 2007–2013, and 3) patients identified from death certificates issued during 1995–2014 with SFG rickettsiosis–related causes of death. Chart reviews were performed and patients were classified according to the Council of State and Territorial Epidemiologists' case definition. Of 254 SFG Rickettsia–positive serologic specimens from the reference laboratory, 129 (51%) met the case definition for confirmed or probable cases of rickettsial disease after chart review. The sensitivity of the TDH surveillance system to detect cases was 45%. Of the 98 confirmed or probable cases identified from the medical center, the sensitivity of the TDH surveillance system to detect cases was 34%. Of 27 patients identified by death certificates, 12 (44%) were classified as confirmed or probable cases; four (33%) were reported to TDH, but none were correctly identified as deceased. Cases of SFG rickettsioses were underreported and fatalities not correctly identified. Efforts are needed to improve SFG rickettsiosis surveillance in Tennessee.

Author Notes

Address correspondence to Mary-Margaret A. Fill, Division of Communicable and Environmental Diseases and Emergency Preparedness, Tennessee Department of Health, 710 James Robertson Parkway, 4th Floor, Andrew Johnson Tower, Nashville, TN 37243. E-mail: mary-margaret.fill@tn.gov

Authors' addresses: Mary-Margaret A. Fill, Epidemic Intelligence Service, Division of Scientific Education and Professional Development, Centers for Disease Control and Prevention, Atlanta, GA, and Division of Communicable and Environmental Diseases and Emergency Preparedness, Tennessee Department of Health, Nashville, TN, E-mail: mary-margaret.fill@tn.gov. Abelardo C. Moncayo, John R. Dunn, and Timothy F. Jones, Division of Communicable and Environmental Diseases and Emergency Preparedness, Tennessee Department of Health, Nashville, TN, E-mails: abelardo.moncayo@tn.gov, john.dunn@tn.gov, and tim.f.jones@tn.gov. Karen C. Bloch, Division of Infectious Diseases, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, and Department of Health Policy, Vanderbilt University Medical Center, Nashville, TN, E-mail: karen.bloch@vanderbilt.edu. William Schaffner, Department of Health Policy, Vanderbilt University Medical Center, Nashville, TN, E-mail: william.schaffner@vanderbilt.edu.

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