Chlamydia
-related bacteria of the
Chlamydiales
order have recently been described as emerging pathogens that cause pneumonia and abortion in animals and
humans. We investigated the presence of
Chlamydiales
using real-time polymerase chain reaction (PCR) by targeting the 16S rRNA gene of a broad range of
Chlamydiales
in 827 fecal samples from pet birds kept in individual homes in Japan. Of the 827 samples, 493 (59.6%) tested positive for the
Chlamydiales
16S rRNA gene in the real-time PCR assay. We determined the nucleic acid sequences of PCR products from 17
Chlamydiales
strains. A homology search and phylogenetic analysis
using these sequences confirmed that the detected
Chlamydiales
included
C. pecorum
and a broad range of
Chlamydia
-related bacteria. To the
best of our knowledge, this is the first study to detect a wide range of
Chlamydia
-related bacteria in birds.