Which diseases are transmitted by mosquitoes?

The correct choice identifies a range of diseases known to be transmitted by mosquitoes, showcasing the significant role these insects play as vectors in the spread of various pathogens.

Mosquitoes are responsible for transmitting several serious diseases, including malaria, which is caused by parasites and is particularly prevalent in tropical regions, and yellow fever, a viral disease linked to significant morbidity and mortality in certain areas. Encephalitis, which can result from various viruses, also has mosquito-based transmission routes. Other notable illnesses include dengue fever, which is known for causing severe flu-like symptoms and is widespread in tropical and subtropical regions, and the West Nile virus, which has gained prominence in various parts of the world, including North America, over recent decades.

This choice reflects an accurate understanding of the public health impact of mosquito-borne diseases and their prevalence in different geographic locations, illustrating the importance of mosquito control measures in reducing the risk of these illnesses. The other options are too limited in scope, failing to encompass the broad range of diseases that mosquitoes can spread.