Mumbai, April 18 -- I am sometimes asked, "What really is public health?" The term refers to the health of populations, in contrast to clinical health, which considers one patient's well-being. Public health also has a larger prevention component - for example mass immunisation programmes. It has multiple components: disease surveillance, epidemiology (transmission routes of diseases), designing programmes for scale (supply, demand, advocacy components), monitoring and evaluation, effective management, financing and more....