Analysis of Health-Care Charges in Murine Typhus: Need for Improved Clinical Recognition and Diagnostics for Acute Disease

Rahat F. Vohra Department of Internal Medicine—Infectious Diseases, University of Texas Medical Branch, Galveston, Texas;

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David H. Walker Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Lucas S. Blanton Department of Internal Medicine—Infectious Diseases, University of Texas Medical Branch, Galveston, Texas;

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Murine typhus, caused by Rickettsia typhi, is an undifferentiated febrile illness with no available rapid and sensitive diagnostic assay for use during early disease. We aimed to compare the health-care charges in those diagnosed with murine typhus to those with influenza, a febrile illness with an available rapid diagnostic test. A comparison of health-care–associated charges at the University of Texas Medical Branch at Galveston demonstrated a median of $817 for influenza versus $16,760 for murine typhus (P < 0.0001). Median laboratory ($184 versus $3,254 [P < 0.0001]) and imaging charges ($0 versus $514 [P < 0.0001]) were also higher in those with murine typhus. Those receiving at least one imaging study during their illness were greater in the murine typhus group (91.3% versus 20.3%) (P < 0.0001). The median time needed to establish a confirmed or presumptive diagnosis was 2 days for influenza compared with 9 days for murine typhus (P < 0.0001). The median number of health-care encounters was greater for those with murine typhus (2 versus 1) (P < 0.0001). Eleven patients (15.9%) with influenza were hospitalized as a result of their illness compared with 16 (69.6%) with murine typhus (P < 0.0001). The estimated mortality based on disease severity at presentation by Acute Physiology and Chronic Health Evaluation II scoring was similar in the two groups—both had a median 4% mortality risk (P = 0.0893). These results highlight the need for improved clinical recognition and diagnostics for acute rickettsioses such as murine typhus.

Author Notes

Address correspondence to Lucas S. Blanton, Department of Internal Medicine—Infectious Diseases, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555-0435. E-mail: lsblanto@utmb.edu

Financial support: This study was conducted with the support of the Institute for Translational Sciences at the University of Texas Medical Branch, supported in part by a CTSA Mentored Career Development (KL2) Award (KL2TR001441) from the National Center for Advancing Translational Sciences, National Institutes of Health.

Authors’ addresses: Rahat F. Vohra and Lucas S. Blanton, Department of Internal Medicine—Division of Infectious Diseases, University of Texas Medical Branch, Galveston, TX, E-mails: rahatvohra@gmail.com and lsblanto@utmb.edu. David H. Walker, Department of Pathology, University of Texas Medical Branch, Galveston, TX, E-mail: dwalker@utmb.edu.

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