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Clinical Microbiology Reviews, Jan 1996, 18-33, Vol 9, No. 1
DN Fredericks and DA Relman
Over 100 years ago, Robert Koch introduced his ideas about how to prove a
causal relationship between a microorganism and a disease. Koch's
postulates created a scientific standard for causal evidence that
established the credibility of microbes as pathogens and led to the
development of modern microbiology. In more recent times, Koch's postulates
have evolved to accommodate a broader understanding of the host-parasite
relationship as well as experimental advances. Techniques such as in situ
hybridization, PCR, and representational difference analysis reveal
previously uncharacterized, fastidious or uncultivated, microbial pathogens
that resist the application of Koch's original postulates, but they also
provide new approaches for proving disease causation. In particular, the
increasing reliance on sequence-based methods for microbial identification
requires a reassessment of the original postulates and the rationale that
guided Koch and later revisionists. Recent investigations of Whipple's
disease, human ehrlichiosis, hepatitis C, hantavirus pulmonary syndrome,
and Kaposi's sarcoma illustrate some of these issues. A set of molecular
guidelines for establishing disease causation with sequence-based
technology is proposed, and the importance of the scientific concordance of
evidence in supporting causal associations is emphasized.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Sequence-based identification of microbial pathogens: a reconsideration of Koch's postulates
Department of Medicine, Stanford University School of Medicine, California 94305, USA.
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