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Target identification is the first step in the drug and vaccine discovery process; in silico subtractive genomics is widely used in this process. Using this approach, in recent years, a large number of targets have been identified for bacterial pathogens that are either drug resistant or for which no suitable vaccine is available; most such reports concern a specific pathogen. The in silico method reduces the time as well as the cost of target screening. Although a powerful technique that can be applied to a wide range of pathogens, there are many pitfalls in the analysis and interpretation of the data. We review this approach, including targets that have been identified with this technique and various other aspects, including advantages and disadvantages. We also discuss our own experiences using this technology. Drug Dev Res 72: 162–177, 2011. © 2010 Wiley‐Liss, Inc.