preventing endocarditis

My husband recently had surgery for inguinal hernia repair.  He acquired a nosocomial wound infection which turned out to be staphylococcus lugdunensis.  He is 5 weeks post operative and still has and open wound which requires daily packing and dressing.  He completed a 7 day regimen of Augmentin BID post-operatively.  My question is with reagard to case studies posted online detailing incidences of endocarditis following surgical infections of staph lugdunensis (these occuring with some frequency in persons involved in inquinal or perineal invasive procedures).  These persons also received antibiotic IV or PO therapy and were presumed "cured"  but weeks later were found to have developed endocarditits due to staph lugdunensis.

How can we prevent this?  How worried should we be?  What should we watch for?  Anything else we need to know?  
Thank you very much for your help.