Which disease is not transmitted by mosquitoes?

Ebola is not transmitted by mosquitoes, making it the correct choice in response to the question. The Ebola virus is primarily spread through direct contact with the bodily fluids of an infected person or from animals that can harbor the virus, such as fruit bats or nonhuman primates. This mode of transmission is vastly different from the diseases listed in the other options.

Dengue fever, Zika virus, and malaria are all diseases that are transmitted through mosquito bites. For instance, dengue and Zika are primarily spread by the Aedes mosquito, while malaria is transmitted by the Anopheles mosquito. These differences in transmission methods highlight the unique aspects of each disease, emphasizing that Ebola is not associated with vector-borne transmission like those caused by mosquitoes. Understanding the modes of transmission is crucial for implementing effective prevention and control strategies for infectious diseases.