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This study was investigated to diagnose pathogenic organisms of atrophic piglets in northern area ofthe Gyeongnam province, Korea. Samples such as feces, blood and necropsy specimens of 42 atrophicpiglets (≤10 weeks old) were taken from May to December 2013 for this survey. Samples were examinedby reverse transcriptase-polymerase chain reaction (RT-PCR) assay and bacteria isolation for detectionof pathogenic agents. 93 pathogens were isolated from 42 samples can be classified into llgroups. We identified bacterial agents in 56 cases (60.2%) and viral agents in 31 cases (33.3%). However, 6 cases (6.5%) were undetected. Among these pathogens, the most prevalent disease wereporcine reproductive and respiratory syndrome (PRRS) in 22 cases (23.7%). The major diseases wereColibacillosis in 15 cases (16.1%), Glasser's disease in 12 cases (12.9%), and porcine epidemic disease(PED) in 9 cases (9.7%). Mixed infections were accounted for 77.8% of atrophic piglets. In particular,the rate of mixed infections with PRRS virus showed the highest frequency (71.4%). In addition, thereis a seasonal variation. Viral pathogens were dominantly detected in winter, but in the rest of the seasonbacterial agents were mainly detected. Gastrointestinal diseases occurred mainly in the pre-weaning piglets,the respiratory diseases and wasting diseases occurred mainly in the post-weaning piglets.

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