Which symptom profile is associated with diphtheria?

• A. Difficulty breathing and swallowing with thick gray buildup in throat or nose
• B. Cough, sore throat, and fatigue during flu season
• C. Cough, fever, chest pain, and anosmia (loss of smell)
• D. Barrel chest, pursed-lip breathing, cyanosis, and dyspnea on exertion

Answer: (A)

Diphtheria classically presents with a thick gray-white pseudomembrane that can coat the throat and nasal passages, leading to airway irritation and potential obstruction. The combination of difficulty breathing and swallowing along with a thick gray buildup in the throat or nose is the hallmark that points to diphtheria. This membrane forms from necrotic tissue and inflammatory exudate and can bleed if scraped, making it a distinctive sign.

Other patterns fit other illnesses: a flu-like syndrome emphasizes general viral symptoms without a characteristic membrane; loss of smell with fever and chest pain suggests other infections like COVID-19 or other respiratory pathogens; a barrel‑chested, pursed-lip breathing pattern with cyanosis points toward chronic lung disease such as COPD. But none of those feature the thick pseudomembrane that characterizes diphtheria.