Comparison of antibiotic MICs against MRSA (ATCC 43300) determined in four plate types with and without the addition of 0.002% Tween 80 or LHB, with and without the addition of human serum or lung surfactant, as follows: Corning NBS (A), Corning TC (B), Corning PS (C), and Trek PS (D). Note that each hexagon represents one antibiotic-strain pair. If the MIC remains constant across plate types/conditions, the plot should be symmetrical, as is generally the case for vancomycin (blue).