<prompt> A patient needs antibiotic treatment for aificial valve, culture-positive infective enterococcal endocarditis. His medical history includes severe anaphylactic reaction to penicillin G during the past year. The best approach would be treatment with:Amoxicillin-clavulanic acidAztreonamCefazolin plus gentamicinVancomycin  <response>: Severe allergy to penicillins rule out the use of amoxicillin and cefazolin. Vancomycin is highly effective against MRSA and enterococcal infections. Drugs for VRSA and VRE Vancomycin Resistant Enterococcus faecalis include linezolid and daptomycin. 