Michael McKay's guest is Professor Didier Pittet. He is an infectious diseases expert of global reputation and the director of the Infection Control Programme and WHO Collaborating Centre on Patient Safety at the University Hospital of Geneva, known locally as the HUG.

For the past 15 years, he has also been the External Lead of the World Health Organization (WHO) Global Patient Safety Challenge "Clean Care is Safer Care" and African Partnerships for Patient Safety.