Streptococcus pneumoniae(12) Shigella(5) pneumococcus(5) O antigen(4) Shigella flexneri(4) Salmonella(4) lipopolysaccharide(4) virulence factors(3) blood-brain barrier(2) SPI1(2) virulence(2) wzy-dependent pathway(2) stress response(2) c-di-AMP(2) cdaA(2) type III secretion(2) LPS(2) quorum sensing(2) Invasion(2) Sf6(1) Salmonella enterica serovar Enteritidis(1) CSP(1) phase variation(1) small RNA identification.(1) proteasomal degradation(1) O antigen copolymerase(1) WzzpHS2(1) copper efflux.(1) phosphate uptake(1) colony opacity determinant(1)