The likely agent responsible for a cluster of workers with cough, pulmonary edema, and protein-rich bronchial aspirates leading to deaths is what?

• A. Ricin
• B. Mustard gas
• C. Cyanide
• D. Anthrax

Answer: (A)

Inhaled toxins that cause severe lung injury and edema with protein-rich secretions point toward ricin. Ricin disrupts protein synthesis inside cells, leading to rapid death of respiratory tract and alveolar cells. As the lung barrier becomes leaky, plasma proteins flood into the airways, producing protein-rich bronchial aspirates and pulmonary edema. In a cluster of workers exposed to an aerosolized toxin, this pattern—cough, progressive pulmonary edema, and high-protein airway secretions—fits ricin exposure and can be fatal.

Mustard gas also damages the lungs and causes delayed pneumonitis and edema, but the hallmark airway secretions are not as specifically protein-rich and the onset is typically different. Cyanide causes rapid systemic hypoxia and death without the primary pulmonary edema and high-protein airway secretions described. Anthrax inhalation presents with flu-like illness that can progress to mediastinal widening and severe pneumonia, but the key feature of protein-rich airway exudates is more characteristic of ricin’s effect on the lungs.