What IS diphtheria and how does the bug spread?

Diphtheria, a disease once called ‘the strangler’ for how it ravaged Victorian-era children, could be spreading in the UK again. Here, MailOnline answers all your questions about the disease.Diphtheria, a disease once called ‘the strangler’ for how it ravaged Victorian-era children, could be spreading in the UK again. Here, MailOnline answers all your questions about the disease.Read MoreHealth News | Mail Online