Occurrence and significance of pathogenicity and fitness islands in environmental vibrios

a–c Circular presentation of the second chromosome of a Vibrio parahaemolyticus environmental strain TS-8-11-4, b Vibrio vulnificus environmental strain WR-2-BW, and c Vibrio diabolicus environmental strain JBS-8-11-1. Track 1, forward coding sequences; track 2, reverse coding sequences; track 3, tRNA genes; track 4, red, pathogenicity islands, blue, genomic fitness islands; track 5, virulence and virulence-associated genes; track 6, genes involved in toxin–antitoxin systems; track 7, mobile genetic elements. Virulence and virulence-associated genes are numbered and are defined via the center text boxe