Three scientists will share the 2008 Nobel Prize in Physiology or Medicine for their discoveries of deadly viruses, Sweden’s Karolinska Institute announced this morning. The winners are Harald zur Hausen, of the German Cancer Research Center, in Heidelberg, Germany; Françoise Barré-Sinoussi, of the Pasteur Institute, in Paris; and Luc Montagnier, of the World Foundation for AIDS Research and Prevention, also in Paris. Dr. zur Hausen, who is being recognized for his discovery that human papilloma viruses cause cervical cancer, will receive one-half of the prize, which is worth about $1.4-million this year. Ms. Barré-Sinoussi and Mr. Montagnier are being honored for their discovery of human immunodeficiency virus, the microbe that causes AIDS . They will share the other half of the prize. The award, along with other Nobel Prizes to be announced this week, will be presented in December. —Andrew Mytelka