Table 2

Amino acid mutations at residues 120 and/or 121 that confer resistance to penicillin and tetracycline in N. gonorrhoeae.

porB

Lys (120)

Asp-Asp (120–121)

Asp (120 or 121)

Other AA (120 or 121)

Total

R strains

24

0

0

0

24 (100%)

S strains

15

0

2

7

17 (70.8%)

Pérez-Losada et al. BMC Evolutionary Biology 2007 7:84   doi:10.1186/1471-2148-7-84