Which disease is not typically transmitted by insects?

Tetanus is caused by a bacterium known as Clostridium tetani, which is typically found in soil, dust, and manure. It enters the human body through wounds or cuts rather than being transmitted by insects. This distinguishes it from diseases like malaria, typhus fever, and yellow fever, which are specifically vector-borne diseases transmitted through insect bites. For example, malaria is transmitted by Anopheles mosquitoes, typhus fever is commonly spread by lice and fleas, and yellow fever is transmitted by Aedes mosquitoes. Each of these diseases relies on insects as vectors to facilitate their transmission to humans, illustrating the distinction between vector-borne and non-vector-borne diseases.