Aminoglycosides--therapeutic use Animals Anti-Bacterial Agents--therapeutic use Aortic Valve--ultrastructure Candidiasis--drug therapy Cefazolin--therapeutic use Disease Models, Animal Drug Combinations Endocarditis, Bacterial--drug therapy Gentamicins--therapeutic use Penicillins--therapeutic use Rabbits Staphylococcal Infections--drug therapy Streptococcal Infections--drug therapy Vancomycin--therapeutic use