If urinary incontinence along with vomiting after exposure is observed, which agent category might be implicated?

• A. Biological agents
• B. Nerve agents
• C. Radiological agents
• D. Nuclear materials

Answer: (B)

The question tests recognizing the acute cholinergic syndrome seen with nerve agent exposure. Nerve agents inhibit acetylcholinesterase, causing a rapid buildup of acetylcholine at muscarinic receptors throughout the body. That leads to parasympathetic overactivity, which includes vomiting and urinary incontinence, along with other signs such as salivation, lacrimation, sweating, bronchial secretions, and pinpoint pupils. The combination of vomiting and incontinence after exposure is a classic pattern pointing to a nerve agent.

Biological agents don’t typically produce this immediate muscarinic pattern; they usually present with fever, malaise, rash, coughing, or other symptoms that depend on the specific organism and incubation period. Radiological or nuclear materials can cause nausea and vomiting as part of radiation sickness, but the characteristic rapid, diffuse muscarinic signs—especially urinary incontinence—are more aligned with nerve-agent–induced cholinergic toxicity.