In 1983, scientists at the Pasteur Institute in Paris became the first to identify the HIV virus. It was a vital step in fighting one of the worst epidemics in modern history, AIDS.
The Pasteur had been asked to investigate after reports of a mystery disease that was spreading rapidly, particularly among the gay community.
Two weeks later, scientist Françoise Barré-Sinoussi detected the virus while working on a biopsy sample in the laboratory. She and the team leader, Luc Montagnier were later awarded the Nobel Prize in Medicine.
But the discovery could easily have been missed, as she tells Jane Wilkinson.
(Photo: French virologists Jean-Claude Chermann, Francoise Barre-Sinoussi and Luc Montagnier. Credit: Michel Philippot/Sygma/Sygma via Getty Images)