Diphtheria is a serious infection caused by ?AVirusBBacteriaCFungiDNone of the aboveAnswer: B. Bacteria Read Explanation: Diphtheria is a serious bacterial infection caused by the toxin-producing bacteria Corynebacterium diphtheriae. Symptoms include fever, pharyngitis, and swelling of the neck or skin lesion. Diphtheritic lesions are covered by a pseudomembrane.Read more in App