FILE-- Debbie Ganesh of London, Ont. donates blood at a huge outdoor clinic in Toronto in this July 22, 1998 file photo. Canadians donated 850-thousand units of whole blood last year but it all came from just 3.7 per cent of the population. With just a fraction of Canadians donating blood, Canada may be headed for a supply crisis in the future. (CP PICTURE ARCHIVE/Frank Gunn)