What is the name of the disease that is carried by a mosquito and was also a leading disease in both 1900 and 2000?

The disease carried by mosquitoes that was a leading cause of illness in both 1900 and 2000 is malaria. Malaria is caused by parasites transmitted to humans through the bites of infected Anopheles mosquitoes. Despite advancements in treatment and prevention, it remains a significant public health challenge in many parts of the world.