Abstract: The invention relates to a method for predicting mycobacterial drug resistance by isolating mycobacterial nucleic acid from a sample, obtaining a sample sequence from the nucleic acid, aligning and comparing the sample sequence to a reference sequence and determining for each reference position whether the sample sequence value is the same as a particular sequence value assigned to the position in a table. If both values are the same, a position weight value is assigned to the position. A predictor value is obtained by adding all position weight values and the predictor value is compared to a threshold value. If the predictor value is smaller than the threshold value, drug resistance is predicted. The invention encompasses a system for practicing the method, and the use of certain antibacterial drugs to treat infections by pathogens, resistance of which has been determined by the method of the invention.