Koch's postulates and infectious proteins

Lary Walker, Harry LeVine, Mathias Jucker

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


Koch's postulates were formulated in the late nineteenth century as guidelines for establishing that microbes cause specific diseases. Because the rules were developed for living agents - particularly bacteria - their applicability to inanimate pathogens such as viruses and infectious proteins has been problematic. The unorthodox mechanism by which prion diseases are transmitted, involving specific physicochemical characteristics of the protein as well as susceptibility traits of the host, has made these disorders refractory to analysis within the context of the original Koch's postulates. In addition, evidence is accumulating that other proteopathies, such as AA amyloidosis, apolipoprotein AII amyloidosis, and cerebral Aβ amyloidosis, can be induced in vulnerable recipients by cognate proteinaceous agents. In light of the salient differences in the mode of disease-transmission by microbes and proteins, we propose modifications of Koch's postulates that will specifically accommodate presumed infectious proteins.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalActa Neuropathologica
Issue number1
StatePublished - Jul 2006

Bibliographical note

Funding Information:
Acknowledgments We thank Ingo Autenrieth, John Hardy, Jens Pahnke, Rebecca Rosen, Margaret Walker and Rolf Warzok for helpful discussions. This work was supported by grants from the WoodruV Foundation, NIH (RR-00165), by the Sanders-Brown Center on Aging and Chandler Medical Center of the University of Kentucky, and by the Alzheimer’s Association.


  • Alzheimer's disease
  • Amyloid
  • Apolipoprotein AII
  • Conformational disease
  • Prion

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Clinical Neurology
  • Cellular and Molecular Neuroscience


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