CDC.gov CDC.gov Corynebacterium diphtheriae spread through person-to-person contact Transmission airborne bacterial disease Diphtheria Causes and Transmission http://www.cdc.gov/diphtheria/about/causes-transmission.html Diphtheria spread through person-to-person contact Transmission Diphtheria Causes and Transmission cdc.gov http://www.cdc.gov/diphtheria/about/causes-transmission.html http://www.cdc.gov/diphtheria/about/causes-transmission.html Transmission