Which age group is most usually affected by diphtheria?AAbove 10 yearsBBelow 5 yearsCAdultsDAbove 60 yearsAnswer: B. Below 5 years Read Explanation: Diphtheria is most common in children under the age of five.Symptoms include a sore throat, chills with a low temperature, vomiting, and a headache. A grey membrane can form in the throat or tonsils, causing hoarseness and trouble breathing. Read more in App