The term micrococci (Germanized plural from Micrococcus, Greek mikros = small and kokkos= kernel/grain) refers to several species of gram-positive, aerobic, less pathogenic spherical bacteria, which today are assigned to the various genera of the families Micrococcaceae and Dermacoccaceae. As typical opportunists, species of the genera Micrococcus, Kocuria and Kytococcus can cause infections in humans in immunocompromised individuals and in connection with implanted foreign bodies. Purulent skin infections have also been described.