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This page is a spellcheck for word diphtheria. All Which is Correct spellings and definitions, including "Diphtheria or diphtheria" are based on official English dictionaries, which means you can browse our website with confidence! Common searches that lead to this page: how to spell diphtheria, correct spelling of diphtheria, how is diphtheria spelled, spell check diphtheria, how do you spell diphtheria.