Diphtheria (dif-THEER-e-uh) is a serious bacterial infection that usually affects the mucous membranes of your nose and throat. Diphtheria is extremely rare in the United States and other developed countries, thanks to widespread vaccination against the disease. Diphtheria can be treated with medications.
https://www.mayoclinic.org/diseases-conditions/diphtheria/symptoms-causes/syc-20351897