At present,emerging Chlamydia infections continue to increase,and the taxonomy of Chlamydia is constantly updated.Emerging Chlamydia species are mainly sampled from birds and reptiles based on sequence alignment in bioinformatics,and have identified as zoonotic pathogens.Understanding the biological characteristics of emerging Chlamydia is very important for preventing zoonotic infectious disease.In this review,the new progresses of Chlamydia classification,as well as the biological and epidemiological characteristics of emerging Chlamydia are summarized in order to provide some new insights f...