World Health Organization officer who identified the severe acute respiratory syndrome (SARS), which he died from.
He was an expert on parasitic diseases in children, and was the President of the Italian branch of Doctors Without Borders.
Before SARS took his life, he provided a critical warning called the WHO, and took steps locally to prevent a potential outbreak.
He left behind a wife and three children.
The scientist Nelson Hairston worked with the World Health Organization as well.