The rates of resistance to oral commonly used antibiotics were 20 - 50% (amoxycillin), 16.7 - 50% (sulfamethoxazole / trimethoprim), 4 - 50% (ampicillin), 6 - 37.5% (amoxycillin / clavulanic acid), 10 - 32% (azithromycin), 0 - 25% (ampicillin / sulbactam), 17.2 - 70% (cefaclor), 0 - 30% (cefuroxime) and 0 - 20% (erythromycin).