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Infections with Mycoplasma gallisepticum cause the so-called chronic respiratory disease (CRD) in chickens and infectious sinusitis in turkeys. Infection occurs both horizontally through the air and direct contact as well as vertically through hatching
eggs. The main symptoms include chronic inflammation of the upper respiratory tracts and air sacs, accompanied by disorders of the joints, tendon sheaths and the genital tract. Central nervous disorders can also arise. In addition, laying performance and hatching rates decrease significantly. Mixed infections with viral pathogens, such as Newcastle disease virus (NDV) or infectious bronchitis virus (IBV) are not unusual and can severely aggravate the clinical picture (also as vaccine viruses).
In chickens and turkeys, Mycoplasma synoviae causes infectious synovitis and arthritis, which is clinically manifested by joint swellings and lameness. Inflammation of the air sacs, myocardium and pericardium also occurs. Especially after mixed infections, respiratory symptoms can be seen as well. Stunted growth, reduced laying performance and greenish diarrhoea are also due to the infection. Besides game birds, geese, too, are susceptible to this pathogen.
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