Community health experts are urging those who are deemed to be "at risk of HIV" to have regular tests.
It comes as part of an awareness campaign which has started in advance of national HIV testing week which gets underway on November 18.
Northumbria Healthcare NHS Foundation Trust’s sexual health service says having regular tests can improve health outcomes and reduce the risk of onward transmission.
More people coming forward for HIV testing is critical to reduce late HIV diagnoses and the number of people who remain undiagnosed and therefore controlling the spread of HIV.
Anti-retroviral therapy (ART) has resulted in substantial reductions in acquired immunodeficiency syndrome (AIDS) and deaths in the UK.