Over the last 25 years, the development of new antibiotics has decreased alarmingly (1). The cost of developing any new drug is generally in excess of US$500 million, and it usually takes eight to 10 years from identifying a potential drug candidate to the time it is launched into the market (2). In addition to this, many countries have implemented increased regulation of antibiotic usage, and
... [Show full abstract] there has been a tightening of requirements to obtain regulatory approval of drugs (1). It is not surprising, therefore, that many pharmaceutical companies consider antibiotic research to be of lower financial attractiveness compared with that for other chronic indications (such as depression or heart disease, for example).