E. coli Shigella Staphylococci Salmonella Major pathogen Disease Characteristics Immune Response? Risk grps Virulence factor Location of virulence factor Sequelae Antibiotic/ antitoxin/ self-limiting Please help. E. coli Shigella Staphylococci Salmonella Major pathogen Disease Characteristics Immune Response? Risk grps Virulence factor Location of virulence factor Sequelae Antibiotic/ antitoxin/ self- limiting.