What pest is not known to carry human disease but can seriously affect morale?

Bedbugs are known primarily for the discomfort they cause due to their biting behavior and the associated reactions in humans, such as itching and skin irritation. While they are not vectors for diseases that can be transmitted to humans, their presence can lead to significant psychological distress and a decrease in morale. This morale impact is particularly relevant in settings such as military barracks or communal living environments, where infestations can create unrest and anxiety among individuals. The knowledge that one's living conditions are compromised can lead to heightened stress levels and discomfort, contributing to a decline in overall troop effectiveness or community spirit. Thus, bedbugs are correctly identified as pests that, while not disease carriers, can severely affect morale.