There has been only a small decline in the prevalence of HIV in the last decade, dropping from 5.9 percent to 5 percent between 2001 and 2009 for those aged 15-49 (UNAIDS, 2010). This decrease, whilst important, does not seem impressive compared to over US$5 billion spent fighting AIDS in low and middle income countries each year (the latest available figure is US$5.1 billion in 2008).