Insects can be a nuisance but did you know the severity of harm they can cause? Though they might look harmless singularly, they are responsible for the transmission of bacteria, parasites and some viruses. Insects are vectors, who first get infected themselves when feeding off the blood of infected animals or humans and further transfer that infection to other humans whom they get in contact with. These are some diseases commonly caused by harmful insects/Pests: Leprosy Cockroaches are a carrier of Mycobacterium leprae that is present in their faeces. These are transmitted through their faeces that can cause leprosy. This disease predominantly affects the skin and nerves. Cholera Yet another disease caused by cockroaches, it can cause dehydration and diarrhoea. When exposed to cholera causing bacteria, they further contaminate water with it. Once humans get exposed to this water, they get infected. Plague Though a rare disease, it is quite deadly if not treated. Plague is caused by