There is only one preventative measure that can be taken and that is immunization. It also helps if the carer of the Diphtheria victim washes their hands frequently and stresses his/her hygiene.
How Is Diphtheria Transmitted?
Diphtheria is transmitted by breathing in an effected persons diseased coughs or by the touch of an infected person to someone else, the transmission usually occurs by respiratory droplets. This is why it is crucial that a carer of a Diphtheria victim washes their hands and takes their personal hygiene seriously.