The demobilization of armies is usually associated with the introduction of epidemic diseases into civil communities. There is great possibility of louseborne diseases gaining entrance into the United States unless necessary measures are taken to exclude them. The question as to whether epidemic influenza could have been excluded from this country remains an open one; but it can be said with a certain degree of certainty, that with the application of proper measures, epidemic typhus fever, trench fever and relapsing fever can be excluded. In view of the fact that the louse has spread more disease in the present war than all the other insects combined, its importance as a disease carrier can be appreciated. It is important, therefore, that proper facilities be provided to delouse all returning troops, that the public health authorities provide measures for the delousing of immigrants, and that physicians be on the alert for the