Health worries of former prime minister Atal Behari Vajpayee continued on Friday with AIIMS doctors putting him on "mechanical ventilation" after his respiratory infection worsened.

"He (Vajpayee) continues to have lower respiratory track infection which has worsened since morning. He has be en put on mechanical ventilation in ICU and is being monitored by a team of doctors," Dr Sampath Kumar, head of Cardiac Thoracic Vascular Sciences of AIIMS, said on Friday evening while reading out a brief medical bulletin.

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u00a0Former prime minister Atal Behari Vajpayee

All his basic parametres including blood pressure, liver and kidney functions were normal, Kumar said. 84-year-old Vajpayee continues to be in the ICU. His progress is being monitored by a team of doctors, AIIMS Medical Superintendent Dr D K Sharma said in a bulletin earlier in the day. The doctor had yesterday said Vajpayee "is not having fever and his lower respiratory track infection is much better. His condition is stable."

BJP leaders L K Advani and Rajnath Singh had yesterday called on Vajpayee, who was admitted to the prestigious hospital on Tuesday night.