The portrait of Satoshi Omura of Japan and an illustration describing his work are displayed on a screen during a press conference of the Nobel Committee to announce the winners of the 2015 Nobel Medicine Prize on October 5, 2015 at the Karolinska Institutet in Stockholm, Sweden. Irish-born William Campbell, Satoshi Omura of Japan and China’s Youyou Tu won the Nobel Medicine Prize for their discoveries of treatments against parasites, the jury said.

Three scientists from Ireland, Japan and China won the Nobel Prize in medicine on Monday for discoveries that helped doctors fight malaria and infections caused by roundworm parasites.

The Nobel judges in Stockholm awarded the prestigious prize to Irish-born William Campbell, Satoshi Omura and of Japan and Tu Youyou — the first ever Chinese medicine laureate.

Campbell and Omura were cited for discovering a drug that has helped lower the incidence of river blindness and lymphatic filariasis, two diseases caused by parasitic worms.

Tu discovered a drug that has helped significantly reduce the mortality rates of malaria patients.

“The two discoveries have provided humankind with powerful new means to combat these debilitating diseases that affect hundreds of millions of people annually,” the committee said. “The consequences in terms of improved human health and reduced suffering are immensurable.”

Campbell is a research fellow emeritus at Drew University in Madison, New Jersey. Omura, 80, is a professor emeritus at Kitasato University in Japan and is from the central prefecture of Yamanashi. Tu is chief professor at the China Academy of Traditional Chinese Medicine.

The medicine award was the first Nobel Prize to be announced. The winners of the physics, chemistry and peace prizes are set to be announced later this week. The economics prize will be announced next Monday. No date has been set yet for the literature prize, but it is expected to be announced on Thursday.

The winners will share the 8 million Swedish kronor (about $960,000) prize money with one half going to Campbell and Omura, and the other to Tu. Each winner will also get a diploma and a gold medal at the annual award ceremony on Dec. 10, the anniversary of the death of prize founder Alfred Nobel.

Last year’s medicine award went to three scientists who discovered the brain’s inner navigation system.

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