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The outbreak of chlamydiosis in one of the western provinces of Poland, was diagnosed accidentally as a concurrent infection in a commercial laying hen flock during an outbreak of fowl pox. For histological examination, skin and subcutaneous tissue samples from lesions on heads of the birds were collected. Swabs from throat and trachea have been examined by nested PCR, real-time PCR, and partial  omp A sequencing. Detailed electron microscopy analysis revealed fowl pox intracytoplasmic inclusions, called  Bollinger bodies , and the presence of other intracytoplasmic inclusions; specific for  Chlamydia  sp. Results of nested PCR confirmed the presence of  Chlamydiaceae  sp. in two tested samples. Surprisingly, one of the two  Chlamydiaceae -positive cases turned out to be infected with a non-classified strain. Results of real-time PCR and sequencing confirmed the presence of a new  Chlamydia  species that has not been found in Poland to date. Partial sequencing and BLAST analysis of  omp A gene sequence confirmed the highest homology to non-classified poultry strains of  Chlamydia  sp. that were previously detected in Germany and France. The zoonotic potential and the exact taxonomic status of this atypical strain have yet to be defined.

Detection of a new Non-Classified Chlamydia Species in Hens in Poland