In the name of the Board of the International Children's Centre I am most happy to welcome you. Many of you have come long distances. Others have had difficulty coming. We thank you all for being here.
We will spend three days studying a problem which has particular interest for us. Viral hepatitis is widespread. At one time I taught that in most countries the entire population was affected, as it is by measles, rather early in life. Is this correct? We shall find out during these ensuing days.
In the field which we shall study, as happens frequently, each finding and new discovery may raise more problems than they resolve. The pathways of infection, the appearance of severe forms, the eventual progress toward chronicity, the importance of inconspicuous types, the existence of carriers and congenital hepatitis have, for a long time, presented problems which have been inadequately resolved. When