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Original Article
Volume 338:1861-1868 June 25, 1998 Number 26
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An Outbreak of Multidrug-Resistant Pneumococcal Pneumonia and Bacteremia among Unvaccinated Nursing Home Residents
J. Pekka Nuorti, M.D., Jay C. Butler, M.D., James M. Crutcher, M.D., M.P.H., Ramon Guevara, M.P.H., David Welch, Ph.D., Patricia Holder, M.T., and John A. Elliott, Ph.D.

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 by Musher, D. M.

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ABSTRACT

Background Outbreaks of pneumococcal disease are uncommon and have occurred mainly in institutional settings. Epidemic, invasive, drug-resistant pneumococcal disease has not been seen among adults in the United States. In February 1996, there was an outbreak of multidrug-resistant pneumococcal pneumonia among the residents of a nursing home in rural Oklahoma.

Methods We obtained nasopharyngeal swabs for culture from residents and employees. Streptococcus pneumoniae isolates were serotyped and compared by pulsed-field gel electrophoresis. A retrospective cohort study was conducted to identify factors associated with colonization and disease.

Results Pneumonia developed in 11 of 84 residents (13 percent), 3 of whom died. Multidrug-resistant S. pneumoniae, serotype 23F, was isolated from blood and sputum from 7 of the 11 residents with pneumonia (64 percent) and from nasopharyngeal specimens from 17 of the 74 residents tested (23 percent) and 2 of the 69 employees tested (3 percent). All the serotype 23F isolates were identical according to pulsed-field gel electrophoresis. Recent use of antibiotics was associated with both colonization (relative risk, 2.3; 95 percent confidence interval, 1.3 to 4.2) and disease (relative risk, 3.6; 95 percent confidence interval, 1.2 to 10.8). Only three residents (4 percent) had undergone pneumococcal vaccination. After residents received pneumococcal vaccine and prophylactic antibiotics, there were no additional cases of pneumonia, and the rates of carriage decreased substantially.

Conclusions In this outbreak a single pneumococcal strain was disseminated among the residents and employees of a nursing home. The high prevalence of colonization with a virulent organism in an unvaccinated population contributed to the high attack rate. Clusters of pneumococcal disease may be underrecognized in nursing homes, and wider use of pneumococcal vaccine is important to prevent institutional outbreaks of drug-resistant S. pneumoniae infection.


Source Information

From the Epidemic Intelligence Service, Epidemiology Program Office (J.P.N.), and the Respiratory Diseases Branch, National Center for Infectious Diseases (J.P.N., J.C.B., R.G., P.H., J.A.E.), Centers for Disease Control and Prevention, Atlanta; Oklahoma State Department of Health, Oklahoma City (J.M.C.); and University of Oklahoma Health Sciences Center, Oklahoma City (D.W.).

Address reprint requests to Dr. Butler at the Respiratory Diseases Branch, MS C-23, Centers for Disease Control and Prevention, 1600 Clifton Rd., Atlanta, GA 30333.

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