Sexually transmitted infections (STI) continue to be a major cause of morbidity and mortality, both in developed industrial countries as well as in the developing world. Human immunodeficiency virus infections and the ensuing opportunistic infections are a major drain on the human and financial resources of many countries in the developing world and even with the availability of effective treatment the epidemic is not yet contained. Screening in developing worlds is difficult and there is a need for simple reliable cheap diagnostic methods that can be performed at the point of care, on the...