Epidemiology and Infection

Intestinal infections

Direct healthcare costs of selected diseases primarily or partially transmitted by water

S. A. COLLIERa1a2 c1, L. J. STOCKMANa3, L. A. HICKSa3, L. E. GARRISONa3, F. J. ZHOUa3 and M. J. BEACHa2

a1 International Health Resources Consulting, Inc., Atlanta, GA, USA

a2 National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA

a3 National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA

SUMMARY

Despite US sanitation advancements, millions of waterborne disease cases occur annually, although the precise burden of disease is not well quantified. Estimating the direct healthcare cost of specific infections would be useful in prioritizing waterborne disease prevention activities. Hospitalization and outpatient visit costs per case and total US hospitalization costs for ten waterborne diseases were calculated using large healthcare claims and hospital discharge databases. The five primarily waterborne diseases in this analysis (giardiasis, cryptosporidiosis, Legionnaires' disease, otitis externa, and non-tuberculous mycobacterial infection) were responsible for over 40 000 hospitalizations at a cost of $970 million per year, including at least $430 million in hospitalization costs for Medicaid and Medicare patients. An additional 50 000 hospitalizations for campylobacteriosis, salmonellosis, shigellosis, haemolytic uraemic syndrome, and toxoplasmosis cost $860 million annually ($390 million in payments for Medicaid and Medicare patients), a portion of which can be assumed to be due to waterborne transmission.

(Accepted December 07 2011)

(Online publication January 11 2012)

Correspondence:

c1 Author for correspondence: S. A. Collier, MPH, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Mailstop F-22, 1600 Clifton Road NE, Atlanta, GA 30333, USA. (Email: scollier@cdc.gov)

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