Official figures show 71 per cent of duty-time lost in the AEF in France was through disease, against just 22 per cent from battle injuries.
The Army had a 'delousing' program which consisted of infrequent visits of a large tank-truck-like device and a steam generator. We were required to completely disrobe and toss our clothes into a bundle which was then thrown into the tank and live steam cooked the bugs. During this time we froze, of course, since the contraption never came on a nice warm day, but usually made its appearance during the winter months.
http://1914-1918.invisionzone.com/forums/topic/173218-ww1-military-motors-1916-set-x-50-cards/?page=84
http://1914-1918.invisionzone.com/forums/topic/173218-ww1-military-motors-1916-set-x-50-cards/?page=126 has a lot more photos