Table 2.

Susceptibility to doxycycline and minocycline ofA. actinomycetemcomitans ATCC 29522 cultivated under either poor or rich iron conditions

Antibiotic and iron source (μM)MIC (μg/ml)
Assay 1Assay 2
Doxycycline
 FeSO4
   10.0940.094
   50.250.125
  500.500.38
 FeCl3
   10.0320.032
   50.250.125
  500.750.38
Minocycline
 FeSO4
   10.0320.064
   50.0470.064
  500.190.25
 FeCl3
   10.0320.047
   50.0470.047
  500.190.19