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The common name for any member of the order Spirochaetales.



a bacterium, measuring 0.1–0.6 micrometer in diameter and 5–500 micrometers in length, in the form of an elongated coiled spiral. The majority of species have a slender axis filament around which the body of the cell is spirally coiled. Spirochetes lack flagella and are characterized by undulating movements, during which the cells rotate around their long axis. Reproduction is by transverse fission.

Spirochetes may be nonpathogenic or pathogenic. The former inhabit freshwaters, and the latter parasitize mollusks and cause syphilis in man (Treponema pallidum), relapsing fever (Borrelia recurrentis), and other spirochetoses. Under artificial conditions, nonpathogenic spirochetes grow on ordinary nutrient mediums and pathogenic spirochetes grow on mediums that contain serum and pieces of fresh tissue or the internal organs of animals. Some forms have not yet been grown in the laboratory.

References in periodicals archive ?
World distribution of spirochetal diseases, 2 Relapsing fevers, Louse-borne and Tick-borne", Atlas of Diseases, Plate 16, Geographical Review, vol.
The JH reaction occurs when treating any spirochetal infection.
With today's sensitive tests for spirochetal antibodies we can be even more sure than Hudson was, when he expressed the same doubt, that the bulk of the population, even in areas where there is a lot of syphilis, have never had any contact with the spirochete of syphilis or its close relatives.
A somewhat different approach is the use of an assay based on two closely related spirochetal proteins that are not found in other species of bacterial spirochetes.
They reported that ceftriaxone pulse dosing did, indeed, kill the spirochetal and round body forms of B.
However, "40% of borrelial DNA is located on plasmids, including highly polymorphic genes, such as ospC (26), which encode immunogenic proteins involved in spirochetal virulence.
It was believed that spirochetal organism mostly acts through multi organ dysfunction syndrome (MODS) (Gangadhar et al.
population, and have been associated with multiple conditions, including pregnancy, human immunodeficiency virus (HIV) infection, intravenous drug use, tuberculosis, rickettsial infection, spirochetal infection other than syphilis, bacterial endocarditis, and disorders of immunoglobulin production (2,3).
burgdorferi, the spirochetal agent of Lyme disease, in both U.
The second advantage concerns the nature of the urinary tract itself, which is a known site of spirochetal persistence.
Various forms of uveitis have been described with other spirochetal diseases, including Lyme disease (23), syphilis (24), and leptospirosis (25).