It is not the purpose of this communication to enter into the minute consideration of all phases of the prevention and eradication of diphtheria, but to present briefly the general features of some of the methods which have been found practicable in Minnesota and in which the laboratory has been used as the guide to executive action and restrictive measures.
In the work of the Minnesota State Board of Health, the problems have naturally arranged themselves into three main groups.
I. The routine work of dealing with diphtheria as it occurs in family life.
II. Widespread epidemics in which the day schools have to be closed.
III. Infection which gains entrance into institutions in which children or other inmates are housed, employed, taught or confined, and where great opportunity for the spread of infection is present.
I. DIPHTHERIA IN FAMILY LIFE.
The routine work of the State Board of