What problems caused by lice in World War 1?

During World War I, lice significantly affected soldiers' health and morale, leading to conditions such as trench fever, which caused severe pain and fatigue, and was exacerbated by unsanitary living conditions in the trenches. The presence of lice also contributed to the spread of other diseases, further compromising the military's effectiveness. Additionally, the constant itching and discomfort from lice infestations distracted soldiers from their duties and diminished their overall combat readiness. Efforts to combat lice included improved hygiene measures and the use of insecticides, but infestations remained a persistent issue throughout the war.