Detection of Chromobacterium violaceum by multiplex PCR targeting the prgI, spaO, invG, and sipB genes.

Based on the recently completed genomic sequence of Chromobacterium violaceum American Type Culture Collection (ATCC) 12472 a multiplex PCR assay targeting the prgI, spaO, invG, and sipB genes of the Salmonella SPI-1 homologue type-III secretion system was developed. PCR products of 255bp (prgI), 749bp (spaO), 1685bp (invG), and 1752bp (sipB) were successfully amplified simultaneously in a single reaction with all Chr. violaceum strains investigated whereas other bacteria tested negative. The detection limit for pure cultures in multiplex PCR analysis was 100CFU. The developed assay significantly improves rapid identification of Chr. violaceum and allows its differentiation from closely related organisms.