The World Health Organisation, recognising his contribution, had awarded him the Director-General's Commendation Medal in May, 1998.
In December 2004, Vardhan had come out with his own account on how he conceived and implemented the Pulse Polio programme.
The book, titled - A Tale of Two Drops—was released by Atal Bihari Vajpayee.
Married to Nutan, a specialist in hospital administration who preferred to be a homemaker, Vardhan has two sons and a daughter.
Vardhan is also involved in promoting ideologies of Shyama Prasad Mookherjee, the founder of the Jan Sangh, and Deen Dayal Upadhyay.
As secretary of the Shyama Prasad Mukherjee Foundation, he has taken up projects to assemble the collected works of Mukerjee, to restore his house in Kolkata and to promote research in topics of national importance.