THT's One-hour 'Fastest' Service Aims To Reduce Undiagnosed HIV In Cardiff - In a bid to reduce levels of undiagnosed HIV in Cardiff, HIV and sexual health charity Terrence Higgins Trust (THT) is encouraging people who may have been at risk to attend a local service offering one-hour HIV testing. One in four people who have HIV in the UK are undiagnosed, and there are now more people living with the condition than ever before. [Medical News HIV/AIDS]