... (PMWS) in piglets was identified by autopsy in 110 out of 170 (64.71%) culled piglets from 82 swine farms in 2 provinces in Southeast Vietnam. The main lesion was the swollen lymph nodes, especially ... lymph node of 40 PMWS and 20 n-n-PMWS piglets. In the PMWS piglets, the infection by E. coli was found highest (55%), followed by Streptococcus (42,5%), Salmonella (32,5%), Pasteurella multocida ... Haemophilus parasuis (17,5%). The triple co-infection was found only in the PMWS piglets (20%). Key words : Piglet, PMWS, Lesion, Co-infected bacteria, Prevalence I. ĐẶT VẤN ĐỀ Một trong những...