Yesterday we posted a piece which lauded a potential life saving break-through in the development of a HIV vaccination which could save millions of lives. Today, this news is tempered by a recent announcement by PlusNews a Global HIV/AIDS news and analysis publication which reports that HIV infection rates are on the increase among the intravenous drug user (IDU) populations of many African countries. Health officials in Tanzania are worried about rising HIV-prevalence levels among IDUs, who often use a dangerous cash-saving technique known as "flash blood", in which a user injects heroin or another illegal drug, and then draws a syringe full of blood for a second user to inject.