In 1983, Wong-Staal and colleagues at the NCI were among the first researchers to identify HIV (then called HTLV-III) as the causative agent of AIDS.
In 1983, amid intense scientific competition and public fear surrounding a mysterious new immune-destroying illness, Flossie Wong-Staal and her colleagues in Robert Gallo's laboratory at the National Cancer Institute were among the first researchers worldwide to provide compelling evidence that a retrovirus — then designated HTLV-III, later renamed HIV — was the cause of Acquired Immunodeficiency Syndrome (AIDS).
At the time, the cause of AIDS was fiercely debated, with competing hypotheses ranging from lifestyle factors to other pathogens. French researchers at the Pasteur Institute, led by Luc Montagnier and Françoise Barré-Sinoussi, had also isolated a similar retrovirus (LAV) around the same period, leading to years of scientific and legal disputes over discovery credit that were eventually resolved through international agreements crediting both teams.
Wong-Staal's molecular biology expertise was essential in solidifying the viral hypothesis, as she worked to characterize the genetic material of the virus and demonstrate its consistent presence in AIDS patients. This work provided crucial early evidence that shifted public health and research strategy toward viral etiology, enabling the development of diagnostic blood tests and setting the stage for antiretroviral drug development.
Her contributions during this period, though not tied to a single dated publication, were pivotal in the international scientific effort that identified the causative agent of one of the most devastating pandemics in modern history.