"He has developed jaundice - a sign of severe infection. His clinical condition is extremely critical," said a medical bulletin issued this afternoon by the Post Graduate Institute of Medical Education and Research.
"He continues to be febrile (feverish). The metabolic parameters are almost the same. His oxygen requirement has increased to 80 per cent to maintain the arterial oxygen at the minimal desired level. His X-ray (chest) shows bilateral pulmonary infiltrates," it said.
A resident of Sialkot in Pakistan, Sanaullah, 52, is serving a life term after he was convicted under TADA provisions following his arrest in 1999.
He was injured in a scuffle with another inmate in the high-security Kot Balwal jail in Jammu and was rushed to the PGIMER here in an air ambulance.
The assault came a day after the death of Indian prisoner Sarabjit Singh who was brutally attacked by fellow inmates in Lahore's Kot Lakhpat jail.