Before COVID-19 came along, the two most lethal infectious diseases were HIV and tuberculosis (TB). Even though HIV still lingers, with 1.5 million people contracting the infection every year, epidemiologists point to the availability of many HIV prevention options as a primary reason for the decreasing caseload.
According to the World Health Organization (WHO), over the past two decades, new HIV infections decreased by 49%, HIV-related deaths decreased by 61% and an estimated 18.6 million lives were saved because of new treatments that minimise the infection and prevent its spread.