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Journal of Clinical Microbiology, April 1999, p. 1092-1099, Vol. 37, No. 4
Meningitis and Special Pathogens Branch,
Received 10 September 1998/Returned for modification 10 November
1998/Accepted 7 January 1999
Enhanced surveillance of patients with upper respiratory symptoms
in a Northern Plains community revealed that approximately 4% of
them were infected by toxigenic Corynebacterium diphtheriae of both mitis and gravis biotypes, showing that the organism is still
circulating in the United States. Toxigenic C. diphtheriae was isolated from five members of four households.
Four molecular subtyping methods
0095-1137/99/$04.00+0
Use of Molecular Subtyping To Document Long-Term Persistence
of Corynebacterium diphtheriae in South Dakota
ribotyping, multilocus
enzyme electrophoresis (MEE), random amplified polymorphic DNA
(RAPD), and single-strand conformation polymorphism
were used
to molecularly characterize these strains and compare them to 17 archival South Dakota strains dating back to 1973 through 1983 and
to 5 isolates collected from residents of diverse regions of the United
States. Ribotyping and RAPD clearly demonstrated the household
transmission of isolates and provided precise information on the
circulation of several distinct strains within three households. By
MEE, most recent and archival South Dakota strains were identified as
closely related and clustered within the newly identified ET
(electrophoretic type) 215 complex. Furthermore, three recent South
Dakota isolates and eight archival South Dakota isolates were
indistinguishable by both ribotyping and RAPD. All of these molecular
methods showed that recent South Dakota isolates and archival South
Dakota isolates were more closely related to each other than to the
C. diphtheriae strains isolated in other parts of the
United States or worldwide. The data also supported the improbability
of importation of C. diphtheriae into this area and
rather strongly suggest the long-term persistence of the organism in
this region.
*
Corresponding author. Mailing address: Epidemiologic
Investigations Laboratory, Meningitis and Special Pathogens Branch,
Division of Bacterial and Mycotic Diseases, National Center for
Infectious Diseases, CDC, MS CO2, 1600 Clifton Rd., Atlanta, GA
30333. Phone: (404) 639-1730. Fax: (404) 639-3123. E-mail:
TXP1{at}CDC.GOV.
Journal of Clinical Microbiology, April 1999, p. 1092-1099, Vol. 37, No. 4
0095-1137/99/$04.00+0
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