Actinomycetes
| Auteur: | Microbiology and Immunology on-line University of South Carolina |
| Tags: | Foto's/dia's Lessen/cursussen Leerboek Schimmels Hoger onderwijs Middelbaar onderwijs Engels Medisch/Veterinair |
| Bron: | http://pathmicro.med.sc.edu/mycology/mycology-2.htm 
Melding defecte link. |
Actinomycosis, nocardiosis, streptomycetes In this section, we shall discuss three genera of actinomycetes: Actinomyces, Nocardia, and Streptomyces. These organisms have been shown to be higher bacteria, but they were thought to be fungi for many years because they have filamentous forms, 0.5 to 0.8 microns in diameter, which appear to branch (figure 1). Some species form aerial mycelia in culture. The clinical manifestations of infection are similar to those of a systemic fungal infection. It is now clear that they are not fungi but are closely related to the mycobacteria. Some properties of these genera include: Actinomyces are anaerobic, while Nocardia and Streptomyces are aerobic. Nocardia stain partially acid-fast, Actinomyces and Streptomyces are not acid-fast. Actinomyces and Streptomyces produce granules. Most actinomycetes in tissue do not stain with the H & E stain commonly used for general histopathology. All genera may produce granules; Actinomyces almost always produce granules.
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