衣原体(Chlamydia)是一类进化来源尚未明确、发育周期独特、感染宿主广泛、致病表现复杂、介于细菌和病毒之间的革兰染色阴性微生物。当有传染性无代谢活性的原体(Elementary body,EB)粘附并进入真核宿主细胞后,分化为没有传染性但有代谢活性的网状体(Reticulate body,RB),在寄 Chlamydia is a class of Gram-negative microorganisms that have not yet been clearly defined in their origin of evolution, have unique developmental cycles, have a wide range of host infections, and have complicated pathogenic manifestations, ranging from bacteria to viruses. When an infectious, non-metabolic, primary body (EB) adheres to and enters a eukaryotic host cell, it differentiates into a non-infectious but metabolically active Reticulate Body (RB)