New Delhi, Aug 2 - Health Minister Ghulam Nabi Azad gave a piece of his mind to Health Secretary Naresh Dayal in full public view. At the centenary celebrations of the National Institute of Communicable Diseases (now called National Centre for Disease Control), Azad asked one of his staff members to summon Dayal who was busy talking to the media. Admonishing him, Azad told Dayal not to go exceed the brief as journalists often tend to deviate rather than concentrate on the issue at hand. Curious scientists who missed out the action were keen to know what happened, but a chastened Dayal kept mum throughout the function.