Classification of taxa of Bisgaard
(For references please address international peer-reviewed papers)
Taxonomy is the study of classification, nomenclature and identification while systematics may include genetics, evolution, physiology and ecology. The main task of classification is to outline taxa defined as a real group of organisms recognized as a formal unit at any level of a hierarchic classification (Simpson, 1961, Principles of animal taxonomy). Taxa might be named according to the Prokaryotic Code, provided they are circumscribed by a unique set of characters. This is a very time-consuming process, one of the preconditions of which is a geographically broad and epidemiologically unrelated strain collection. To overcome this problem, my strategy in the diagnostic laboratory has been based on keeping atypical isolates, to generate enough isolates to allow publication of new taxa, to address the international microbiological society, and to speed up collection of similar isolates, the ultimate goal being a safer basis for an unambiguous diagnosis in microbiology. This is a prerequisite for proper treatment, and for improving our knowledge of the complexity of bacterial-host interactions leading to peaceful coexistence or ultimately fatal disease.
During the past decades the roots of bacterial systematics have changed from morphology and biochemistry to molecular biology resulting in many changes in nomenclature. To keep up with these a review is given in the following on the different taxa, I have been working with during the past 30 years.