The incubation period of diphtheria is only 1-7 days. The infection routes are infectious droplets, laundry or touching. The Diphtheria is very contagious.
The clinical picture of diphtheria is very different. There is often nausea, fatigue, pain in swallowing, abdominal pain, body aches and fever on.
Since there is a vaccination against diphtheria is the spread of the disease much less advertised. The diphtheria is contagious during the incubation period.

Diphtheria incubation: 1-7 days.