Health crisis procedures and exercises

• We are interested to learn more about your organisation´s different roles in case of a health crisis emergency (for example an infectious disease outbreak).  If your organisation is involved in management of a public health crisis, what are your duties?
• Did your organisation ever simulate these emergencies for an (internal or joint) exercise? If yes, what are your experiences with this health crisis simulation and are you willing to share some documents?  A wide range of crisis exercise scenarios is welcome: accidents with chemical or biological agents, infectious disease outbreaks,..