Efficacy of Nano-Encapsulated Daptomycin in an Experimental Methicillin-Resistant Staphylococcus aureus (MRSA) Bone and Joint Infection Model.

S. aureus bone infections remain a therapeutic challenge, leading to long and expensive hospitalizations. Systemic antibiotic treatments are inconsistently effective due to insufficient penetration into the infectious site. In an osteomyelitis model, the single local administration of nanoparticle-encapsulated daptomycin allows sterilization of the infectious sites after 4 and 14 days of treatment, while daily systemic treatment of daptomycin for 4 days was not effective. These results demonstrate the great interest of this local antibiotic treatment.