Diphtheria is a highly contagious droplet spread bacterial infection. It’s spread by coughs and sneezes, or through close contact with someone who is infected.
You can also get it by sharing items, such as cups, cutlery, clothing or bedding, with an infected person.
The maximum incubation period for diphtheria is 10 days; however, there may be longer duration of carriage in asymptomatic carriers but there is little evidence. Therefore, close contacts should be identified from 10 days before onset of diphtheria symptoms in a case.