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Clinical Microbiology Reviews, Apr 1997, 320-344, Vol 10, No. 2
Sr Domingue GJ and HB Woody
A considerable body of experimental and clinical evidence supports the
concept that difficult-to-culture and dormant bacteria are involved in
latency of infection and that these persistent bacteria may be pathogenic.
This review includes details on the diverse forms and functions of
individual bacteria and attempts to make this information relevant to the
care of patients. A series of experimental studies involving host-bacterium
interactions illustrates the probability that most bacteria exposed to a
deleterious host environment can assume a form quite different from that of
a free-living bacterium. A hypothesis is offered for a kind of reproductive
cycle of morphologically aberrant bacteria as a means to relate their
diverse tissue forms to each other. Data on the basic biology of persistent
bacteria are correlated with expression of disease and particularly the
mechanisms of both latency and chronicity that typify certain infections.
For example, in certain streptococcal and nocardial infections, it has been
clearly established that wall-defective forms can be induced in a suitable
host. These organisms can survive and persist in a latent state within the
host, and they can cause pathologic responses compatible with disease. A
series of cases illustrating idiopathic conditions in which cryptic
bacteria have been implicated in the expression of disease is presented.
These conditions include nephritis, rheumatic fever, aphthous stomatitis,
idiopathic hematuria, Crohn's disease, and mycobacterial infections. By
utilizing PCR, previously nonculturable bacilli have been identified in
patients with Whipple's disease and bacillary angiomatosis. Koch's
postulates may have to be redefined in terms of molecular data when dormant
and nonculturable bacteria are implicated as causative agents of mysterious
diseases.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Bacterial persistence and expression of disease
Department of Urology, Tulane University School of Medicine, New Orleans, Louisiana 70112, USA. domingue@mailhost.tcs.tulane.edu
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