To understand transmission, you must understand which process?

• A. the process by which pathogens move between individuals
• B. the signs of infection
• C. treatment strategies
• D. immune response

Answer: (A)

Transmission is defined by the mechanism and pathway through which a pathogen moves from one person to another. To understand transmission, you must know how pathogens leave an infected host, travel, and reach a new host—whether by droplets, direct contact, aerosols, or vectors. That focus on the process by which pathogens move between individuals is what makes this option the best fit. Signs of infection, treatment strategies, and immune responses are important for recognizing, managing, and defending against disease, but they describe outcomes or defenses rather than the actual spread from person to person.