In order to confirm the above results a second gentamicin- resistant MRSA clinical isolate was evaluated (MRSA-GM34) ( Fig. 2 C). Similar results were obtained, since a 100% inhibition of the bacterial growth was observed using 4 μg/ml of gentamicin with 4 μg/ml of carnosic acid, while half the amount of the antibi- otic included in the mixture was not able to totally inhibit bacterial growth The experimental results obtained once again suggested a synergistic interaction between carnosic acid and gentamicin