I. Introduction
By far, the main pathogen detection methods are based on Petri culture; colony counting, Enzyme-linked immunosorbent assay (ELISA); based on antibodies or polymerase chain reaction (PCR); nucleic acid detection using DNA microarray, techniques [1]. The reason for this is the high selectivity and reliability of these techniques, which have different strengths and weaknesses. Culture and colony counting is the oldest method and is the one that is generally considered as the reference. It enables the detection of viable cells, but its downside is that it is labor intensive and takes up to several days to yield results. Biosensors are relatively new players in the pathogen detection arena and their performance is generally limited by the use of biological recognition element. Such recognition elements are mostly antibodies or DNA sequences. While DNA based methods; despite their good selectivity and long-term stability; are unable to discriminate between viable and non-viable cells, antibody based biosensors, on the other hand, may suffer from cross binding of other bacteria, which would result in false positives. In addition, antibodies are generally very expensive to produce.