Chlamydophila
| Chlamydophila | |
|---|---|
| Scientific classification | |
| Domain: | Bacteria |
| Phylum: | Chlamydiae |
| Class: | Chlamydiae |
| Order: | Chlamydiales |
| Family: | Chlamydiaceae |
| Genus: | Chlamydophila |
| Species | |
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Chlamydophila is a bacterial genus belonging to the family Chlamydiaceae, order Chlamydiales, class/phylum Chlamydiae.
Chlamydophila was recognized in 1999, with six species in Chlamydophila and three in the original genus, Chlamydia. All Chlamydiae are anaerobic bacteria with a biphasic developmental lifecycle that depends on obligately intracellular growth in eukaryotic host cells.
Prior to 1999, criteria for chlamydial species were not exclusive. For example, at that time genus Chlamydia = family Chlamydiaceae; C. psittaci were distinguished from C. trachomatis by sulfadiazine resistance, although not all C. psittaci were resistant; C. pneumoniae was classified by its appearance under electron microscopy (EM) and its ability to infect humans, although the EM appearance was found to differ from one research group to the next, and all of these species infected humans.
The systematic taxonomy established for Chlamydiae in 1999 uses up-to-date, prevailing criteria for bacterial classification, including DNA-DNA reassociation, 16S and 23S ribosomal RNA gene similarity, sequence similarity clustering of protein coding genes, and genome size. Supporting criteria such as antigen detection,glycogen staining, host association, and EM morphology are also employed, depending on applicability and availability. In 1999, many Chlamydia strains were reorganized into the genus Chlamydophila.
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