Prime Minister Manmohan Singh's two grandsons were diagnosed with dengue fever on Wednesday at the All India Institute of Medical Sciences, doctors said.

Seventeen-year-old Rohan and 11-year-old Madhav were admitted to a private ward of AIIMS with high fever and other symptoms of the disease. Rohan was admitted on Tuesday evening.

Doctors confirmed on Wednesday that both had contracted the viral disease. Rohan and Madhav live at the Prime Minister's official 7 Race Course Residence in New Delhi.

Doctors said their condition was stable.