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Table 1. The order Chlamydiales. Families, genera, species and true hosts

                      Taxon¹                                                      True hosts²

Chlamydiaceae
            Chlamydia
                     trachomatis                                                humans
                     suis                                                           pigs
                     muridarum                                                  mice, hamsters
            Chlamydophila
                     pneumoniae                                                humans, horses? koalas? frogs?
                     psittaci                                                       birds, muskrats, cattle
                     abortus                                                       ruminants
                     felis                                                            cats
                     caviae                                                         guinea pigs
                     pecorum                                                      ruminants, koalas?

Simkaniaceae
              Simkania
                     negevensis                                                  humans

Parachlamydiaceae
              Parachlamydia
                     acanthamoeba                                             amoebae
              Neochlamydia
                      hartmanellae                                               amoebae

Waddliaceae
              Waddlia
                      chondrophila                                               cattle

¹ The classification of Everett et al., (1999) is used.

² A true host is one that is infected in nature, supports multiplication of the pathogen, and releases its progeny to infect more individuals of the same host species (Woodhouse et al., 2001).