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Infection and Immunity, July 2001, p. 4303-4312, Vol. 69, No. 7
Department of Biochemistry and Molecular
Biology1 and Division of Infectious
Diseases,3 Department of Medicine, New York
Medical College, Valhalla, New York 10595, and Department of
Pathology, Montefiore Medical Center, Bronx, New York
104672
Received 13 December 2000/Returned for modification 16 February
2001/Accepted 29 March 2001
Various genotypes of Borrelia burgdorferi sensu stricto
have been previously identified among a large collection of isolates cultured from patients with Lyme disease in the United States. Furthermore, association of specific genotypes with hematogenous dissemination early in the disease course has been observed. The present study assessed kinetics of spirochete dissemination and disease
severity in C3H/HeJ mice infected with two different genotypes of
B. burgdorferi. Spirochete load in plasma and ear and other tissue samples of infected mice was measured by quantitative PCR, and
these data were compared to those obtained by culture and histopathologic analysis. In mice infected with isolate BL206 (a type 1 strain), the peak number of spirochetes was observed in plasma between
day 4 and 7, in heart and ear tissue on day 14, and in joints on day 28 postinoculation. There was a correlation between the peak number of
spirochetes in plasma on day 4 or 7 and that in ear biopsy and joint
specimens on day 14. By contrast, spirochete burdens in plasma of mice
infected with isolate B356 (a type 3 strain) were 16- and 5-fold lower
than those of BL206-infected mice on days 7 and 14 of infection,
respectively. Similarly, approximately 6- and 13-fold fewer spirochetes
were detected in the heart tissues of B356-infected mice compared to
BL206-infected mice. Histopathologically, severe arthritis and aortitis
were noted only in mice infected with isolate BL206. Spirochete
dissemination and disease severity vary significantly in mice infected
with distinct genotypes of B. burgdorferi, suggesting that
genotypic differences in the infecting spirochetes play a key role in
the pathogenesis and development of clinical disease.
0019-9567/01/$04.00+0 DOI: 10.1128/IAI.69.7.4303-4312.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Impact of Genotypic Variation of Borrelia
burgdorferi Sensu Stricto on Kinetics of Dissemination and
Severity of Disease in C3H/HeJ Mice
*
Corresponding author. Mailing address: Department of
Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY 10595. Phone: (914) 594-4658. Fax: (914) 594-3455. E-mail: schwartz{at}nymc.edu.
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