Table 1.

Bacterial strains used in this study.

Strain	Reference or source
E. coli ATCC 25922	ATCC
E. coli ppGpp-null ∆relA ∆spoT	15
E. coli 6424	Clinical isolate
E. coli ESBL KR1557	Clinical isolate
E. coli ESBL KR45	Clinical isolate
K. pneumoniae 1077	Clinical isolate
K. pneumoniae M2836	Clinical isolate
K. pneumoniae M2801	Clinical isolate
B. subtilis 168	36
B subtilis ppGpp-null relA::erm ∆yjbM ywaC::spc	37
E. faecalis 773	38
E. faecalis M1868	Clinical isolate
E. faecalis M2056	Clinical isolate
S. aureus ATCC 25923	ATCC
S. aureus 6285/10	Clinical isolate
S. aureus MRSA RA604	Clinical isolate
S. aureus MRSA RA532	Clinical isolate
S. epidermidis ATCC 12228	ATCC