hiv (human immunodeficiency virus), the virus caused by aids (acquired immunodeficiency syndrome) and is one of the most serious public health challenges in the world. however, the world is committed to preventing new hiv infections and ensuring that everyone living with hiv has access to hiv treatment. in 2019, an estimated 170 million people worldwide are infected with hiv, since 2010, the number of new hiv infections fell by 23%. for example, in one year, this is different from the number of people diagnosed with hiv in one year. worldwide, about 81 percent of people living with hiv know their hiv status in 2019. the remaining 19% (about 710 million people) still need access to hiv testing services. important way hiv testing is the gateway to hiv prevention, treatment, care and support services.