PCR based assays are currently used routinely in most microbiology laboratories. But, with few exceptions, they are restricted to the field of virology, especially to a limited number of viral targets with important economical interest for which commercially well standardized assays are available. For several reasons, it has had a poor implementation of the PCR assays into routine diagnostics for other infectious diseases despite they are advantageous. Combined with automated sample isolation of nucleic acids, real-time PCR gives an ideal platform for the development of molecular assays for a wide range of infectious agents with clinical interest. Because of its advantages, as simplicity, rapidity and minor risk of contamination, real-time PCR will go replace conventional PCR assays and its use will extend to a wide range of applications in clinical microbiology.