Fosfomycin has been used in the treatment of 99 patients suffering from varying kinds of osseous processes and divided into 2 groups, one of 60 patients who were not operated on, and another of 39 who were operated. A treatment only with fosfomycin was tried initially by intravenous infusion (8–16 g/day during 2–4 days), then by the intramuscular route (2–8 g/day during 2–6 days) and finishing with treatment by the oral route (2–4 g/day during 2–6 days). The results have been excellent, all cases progressing with no septic complications. As for secondary effects, we have had only one case in which a rash appeared at the end of treatment. Intravenous infusion has been well tolerated with no sign of phlebitis in