Abstract
Three different agents have been demonstrated by Olson et al. (1) as causes of infectious synovitis in poultry. These were identified as a pox group viral agent or WVU 1675, Mycoplasma synoviae, and Mycoplasma gallisepticum. Other reports have been made of changes in joints of chickens due to Mycoplasma gallisepticum (MG) infection. Delaplane (2), Johnson (3), and Van Roekel et al. (4) described inflammation in joints of chick embryos inoculated with MG isolated from chickens with chronic respiratory disease. Chute and Cole (5) described a synovitis in chick embryos infected with MG. Olson (6), in 1959, described a synovitis in chickens caused by a pleuropneumonia-like organism (PPLO) which he designated as isolate WVU 1791. This isolate later proved to be MG (7). The general pathology in chickens infected with MG has been described by several investigators (8-11). Jungherr et al. (8) described lymphoid cell accumulations in the respiratory system. Johnson (3) reported the specificity of lymphofollicular lesions in the diagnosis of CRD. Olesiuk et al. (12) described lymphofollicular reactions in air sacs and a bronchial exudate in chickens infected with MG.
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