Which category of agents is used to cause disease and often presents with fever and respiratory symptoms?

• A. Vesicants
• B. Blood agents
• C. Pulmonary agents
• D. Biological agents

Answer: (D)

The question tests recognizing how different agent types cause harm. Biological agents are those used to cause disease in people. They trigger the body's infection response, so symptoms often include fever and respiratory signs like cough, shortness of breath, or chest discomfort as the body fights the invading pathogen.

Vesicants are chemical irritants that blister skin and mucous membranes, not infections. Blood agents disrupt cellular respiration and cause rapid illness, but fever isn’t the defining feature. Pulmonary agents irritate the lungs and cause coughing or breathing difficulty, yet they’re chemical irritants, not infectious diseases.

So, biological agents best fit the idea of causing disease with fever and respiratory symptoms.