In the WHO European Region, new HIV diagnoses are increasing each year, with around 160 000 people newly diagnosed in 2017. In 2015, a total of 2.5 million people were estimated to be living with HIV in the Region – 1.5 million in Eastern Europe and Central Asia and 950 000 in Western and Central Europe.
It is estimated that, in the 52 countries which report the relevant data, one in five people living with HIV (20%) is not aware of their infection. The proportion ranges from 13% in the West sub-region, to 17% in the Centre and 24% in the East, with significant variation between countries.
When people living with HIV remain undiagnosed, they are at risk of serious illness and death. In addition, it has been estimated that over half of new HIV infections transmitted sexually are from people who are undiagnosed, because without treatment they are more infectious.