sentences:  Due, in part, to the unavailability of methicillin in the United States, cefoxitin has replaced methicillin for disk diffusion tests, which determine the sensitivity of a bacterial specimen to a given antibiotic.Cefoxitin also yields more accurate results for disk diffusion tests.Interpretive criteria for determining susceptibility to cefoxitin via disk diffusion are greater than or equal to 22mm resulting in a "susceptible" result for "Staphylococcus aureus" and greater than or equal to 25mm for coagulase-negative staphylococci to be considered susceptible.