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Chlamydias are Gram-negative rods that are among the smallest bacteria known (as small as 0.2 mm). They are chemoheterotrophs with an obligate intracellular life cycle. Some strains of this pathogen can be sexually transmitted. Chlamydia cause diseases such as urethritis, psittacosis, trachoma, and pneumonia
Domain Bacteria
Phylum Chlamydiae
Class Chlamidiae
Bergey's Manual Volume 4: The Bacteroidetes, Spirochaetes, Tenericutes (Mollicutes), Acidobacteria, Fibrobacteres, Fusobacteria, Dictyoglomi, Gemmatimonadetes, Lentisphaerae, Verrucomicrobia, Chlamydiae, and Planctomycetes