Dilution factor (Reciprocal),0.4 µg/ml,0.8 µg/ml,1.6 µg/ml,3.2 µg/ml 0,0,0,0,0 0.0039,3,3,2,-4 0.0078,5,5,6,-1 0.0156,9,9,12,5 0.0313,18,20,19,6 0.0625,36,37,35,26 0.125,64,66,61,46 0.25,113,116,102,77 0.5,189,187,178,133 1,266,289,263,210