Unification Church founder hospitalized

Moon Sun-myung, founder of the Unification Church, pictured here on July 22, 2012, is in intensive care.

• Doctors put Moon Sun-myung in intensive care Tuesday
• His doctor has given him only a 50% chance of survival, a church spokesman says
• Spokesman: Different measures are under way in case of the worst case scenario

Seoul (CNN) -- The founder of the Unification Church is unconscious and undergoing treatment for pneumonia at a hospital in South Korea, a spokesman said Thursday.

Doctors put Moon Sun-myung in intensive care Tuesday, where he is breathing through a respirator, the church spokesman said.

Moon felt ill suddenly and was hospitalized at a hospital in Seoul for cold and pneumonia.

He is in "grave condition" and his doctor has given him only a 50% chance of survival, spokesman Ahn Ho-yeol said.

Different measures are under way in case of the worst case scenario, according to the spokesman. He did not elaborate what the measures are.

Followers of the church worldwide are praying for his health, he said.