William C. Campbell, Satoshi Omura and Youyou Tu were awarded the 2015 Nobel Prize in Physiology or Medicine.

Campbell and Omura got half of the prize "for their discoveries concerning a novel therapy against infections caused by roundworm parasites," the Nobel Assembly at Karolinska Institutet said in a statement on Monday. Tu was awarded the other half "for her discoveries concerning a novel therapy against Malaria," it said.

William Campbell, Satoshi Omura and Youyou Tu
William Campbell, Satoshi Omura and Youyou Tu
Photographer: Jonathon Nackstrand/AFP/Getty Images

Annual prizes for achievements in physics, chemistry, medicine, peace and literature were established in the will of Alfred Nobel, the Swedish inventor of dynamite, who died in 1896. The prize in economic sciences was added by Sweden’s central bank in 1968. The total amount for each of the 2015 prizes is 8 million kronor ($962,000).

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