Mycoplasma gallisepticum, Mycoplasma synoviae and Mycoplasma meleagridis are the most widespread pathogenic poultry mycoplasmas. The epidemiology of the infections, and clinical signs, lesions, pathogenesis, diagnosis and control of disease are described. In epidemiology, the constant antigenic composition, variation in virulence, tropism, survival of the mycoplasma outside and within the host and susceptibility to drugs are outlined. The significance of species, age and immune status of the host and the importance of intercurrent infection and debilitating factors in the production of disease are given. The transmission of infection, clinical signs of disease, and gross and histopathological appearances of lesions are described. The interpretation of the pathogenesis of disease is based on the appearance of lesions in untreated birds and in bursectomized or thymectomized chickens. The means of recognizing infection, and the methods used in ameliorating the worst effects of disease or eradicating infection follow.
鸡毒支原体、滑液支原体和火鸡支原体是最广泛传播的致病性家禽支原体。文中描述了这些感染的流行病学、临床症状、病变、发病机制、诊断及疾病控制。在流行病学方面，概述了支原体恒定的抗原组成、毒力变化、嗜性、在宿主体内外的存活情况以及对药物的敏感性。阐述了宿主的种类、年龄和免疫状态的重要性，以及并发感染和衰弱因素在疾病发生中的重要性。描述了感染的传播、疾病的临床症状以及病变的大体和组织病理学表现。疾病发病机制的解释基于未治疗禽类以及法氏囊切除或胸腺切除鸡的病变表现。随后介绍了识别感染的方法，以及用于减轻疾病最坏影响或根除感染的方法。
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