Once the investigations are complete, treatment of identified conditions can occur. For fertility issues, this may involve assisted reproductive technology (ART) such as in-vitro fertilisation (IVF) or fertility medication. There are surgical methods that can be used as treatment however these are now performed less frequently due to the increasing success of the less invasive techniques. Treatment is also required for sexually transmitted infections (STIs). These can take the form of antibiotics for bacterial infections such as chlamydia or highly active anti-retroviral therapy (HAART) for the HIV virus.