A dense, gray coating in the back of the throat, which acts as an artificial membrane, is the trademark symptom of diphtheria. As the disease progresses, the coating may separate from the back of the throat, barricading the air passages and preventing any air from reaching the lungs. Other symptoms include a sore throat, an overall feeling of weakness, fever and shivers, swollen glands, difficulty breathing, increased heart rate, nausea, vomiting, and throbbing in the head.
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