Malaria

Malaria was an insect-transmitted disease, common in swamps and wetlands.

Description
Mosquitoes, ants of the Kebi Swamp, and stirges were among the most common carriers of the disease. Malaria was a seasonal disease in the lands of Kara-Tur. Kozakura's city Jitogawa's Foreign Ward was built by the Shibi Swamp and every summer, several swamp-born afflictions washed over it.

Swamp druids were immune to diseases transmitted by insects, including malaria. Halflings of Luiren learned a special skill of medicinal cooking what involved making foods using Luiren spring cheese. Apprentice cooks knew how to prepare meals that could cure many diseases, including malaria.