Table 2. Current status of the Chlamydiales.
| Family | Genus and species | Biovars | Host/animal disease* |
|---|---|---|---|
| I. Chlamydiacae | Chlamydia trachomatis | Serovars A–K | Humans: trachoma, STI |
| Serovars L1–L3 | Humans: STI | ||
| C. muridarum | – | Mice: proliferative ileitis | |
| C. suis | – | Swine: conjunctivitis: pneumonia | |
| Chlamydophila psittaci | Serovars A–H | Birds, cattle: pneumonia† | |
| C. pneumoniae | 3 biovars | Humans, koala, equines: pneumonia, conjunctivitis | |
| C. pecorum | Wide host range and disease manifestation | ||
| C. felis | ? 2 biovars | Cats: rhinitis† | |
| C. caviae | Guinea pigs: conjunctivitis | ||
| C. abortus | Sheep, cattle, goats: abortion† | ||
| II. Parachlamydiacieae | Parachlamydia acanthamoebae | Amoebae: RTI | |
| Neochlamydia hartmannellae | Amoebae | ||
| Numerous others including UWE25 | |||
| III. Waddliaceae | Waddlia chondrophila | Cattle, potoroos: abortion | |
| IV. Simkaniae | Simkania negevensis | Amoebae, humans: RTI | |
| "Candidatus Fritschea bemesiae" | Whitefly | ||
| "Candidatus F. eriococci" | Whitefly | ||
| V. Chlamydialike organisms | "Candidatus Rhabdochlamydia porcellionis" |
*STI, sexually transmitted infection; RTI, respiratory tract infection; –perhaps (i.e., disputed); ?, may be 2 biovars but not confirmed. †Indicates zoonotic potential.