Which biological agents can cause rapid respiratory failure requiring mechanical ventilation?

• A. Inhalational anthrax and pneumonic plague can cause rapid respiratory compromise; botulism can cause respiratory failure due to paralysis.
• B. Only smallpox causes rapid respiratory failure.
• C. Measles and rubella cause rapid respiratory failure.
• D. No biological agent causes rapid respiratory failure.

Answer: (A)

Some biological threats can lead to respiratory failure that progresses rapidly and needs mechanical ventilation because they either severely impair the lungs or paralyze the muscles used to breathe. Inhalational anthrax can cause swift pulmonary involvement with edema and systemic deterioration, leading to rapid respiratory distress that may require intubation. Pneumonic plague produces a rapidly progressive pneumonia with severe hypoxemia and respiratory failure, often needing ventilatory support to maintain breathing. Botulism causes respiratory failure not from lung damage but from a neurotoxin that blocks acetylcholine release at the neuromuscular junction, resulting in weakness of the diaphragm and other breathing muscles and necessitating ventilation. Other listed illnesses don’t typically present with such abrupt, ventilator-requiring respiratory failure, and saying no agent can cause it isn’t correct.