In addition, strong evidence supports several biological mechanisms through which STIs facilitate HIV transmission by increasing both HIV infectiousness and HIV susceptibility.

Detection and treatment of individuals with STIs is an important part of an HIV control strategy. Monitoring trends in some STIs provides a valuable insight into the likelihood of the importance of sexual transmission of HIV within a country, and is part of second generation surveillance.

Human Immunodeficiency Virus (HIV) At the end of 2008 an estimated 83,000 persons of all ages were living with HIV in the UK, a quarter of whom were unaware of their infection. The infection is still frequently regarded as stigmatising and has a prolonged ‘silent’ period during which it often remains undiagnosed. More information on HIV

Sexually Transmitted Infections (STIs) STIs are diseases that can be transmitted by unprotected sex between two people. Not everyone with an STI will have signs and symptoms of the condition. If a person does present with symptoms, these may include increased discharge, pain or ulcers. If the STIs are left undetected and untreated they may result in serious complications in later years.  More information on STIs

• Statistics (HIV & STI)
• Guidelines
• Laboratory Services - HIV and Sexually Transmitted Infections
• Contacts - HIV and Sexually Transmitted Infections
• HIV and STIs 2005-2009 Reports