The Red Cross says Chad faces a cholera epidemic with 12,713 cases and 364 deaths recorded so far this year.
The International Federation of Red Cross and Red Crescent Societies says cholera has spread to 33 of Chad's 62 districts and the number of cases could double within a few weeks in the fall rainy season.
Cholera is a waterborne infection that is easily preventable with clean water and sanitation.
The humanitarian aid group told reporters Wednesday in Geneva its main concern is to prevent cholera from spreading to more regions of the country and to stop it reaching refugee camps along the Sudanese border.
The IFRC said it is also worried about cholera outbreaks in Cameroon, Niger and Nigeria.