Which of the following best captures the goal of rapidly expanding immunization during an outbreak?

• A. Eliminate all future risk from poliovirus
• B. Provide lifelong immunity after a single dose
• C. Raise population immunity quickly to interrupt transmission
• D. Reduce vaccination coverage to focus on surveillance

Answer: (C)

When an outbreak is underway, the priority is to raise immunity quickly across the population so the virus can no longer spread easily. By boosting the number of immune individuals, the virus finds fewer susceptible hosts, transmission slows, and the outbreak can be stopped. The aim is rapid, high-coverage vaccination in the affected area and among those at highest risk, so the effective reproduction number drops below 1 and cases decline.

This fits best because it focuses on stopping transmission now, which is the immediate goal during an outbreak. The idea of eliminating all future risk from poliovirus is a long-term, global objective rather than a rapid outbreak-control goal. Relying on a single dose to provide lifelong immunity isn’t reliable for polio, since durable protection typically requires multiple doses. Reducing vaccination coverage to prioritize surveillance would undermine outbreak control by leaving more people susceptible.