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We report the seasonal prevalence of the mycoplasmal pneurnoniae of swine (MPS) in slaughter pigs from July of 1999 to June of 2000. Gross finding of lung lesion observed and examined by dot-ELISA. In gross finding of lung lesion from 750 pig samples, 465 (62.0%) was MPS, and 129 (17.2%) was single or double infection with actinobacillosis and pasturellosis. However, 156 (20.8%) had no lesion. In seasonal detection, the prevalence was found to be winter (69.5%), autumn (63.5%), summer (60.0%) and spring (54.7%) in orderly frequency. In dot-ELISA, the result was showed the positive reaction (x16＞titre) with 58.0% and negative (x4＜titer) with 42.0% among a total of 1,710 pigs from 62 farms. In seasonal patterns by dot-ELISA, the prevalence was increased orderly in autumn (61.2%), winter (59.4%), spring (57.8%) and summer (54.4%). Accordingly, the new preventive strategies for MPS are necessary because the prevalence was relatively high especially in winter and autumn.
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