Which statement about the global eradication of smallpox is true?

• A. Enabled through the standardization of vaccines
• B. Accomplished through a comprehensive strategy including vaccination, case finding, and ring vaccination
• C. Considered one of the most significant public health achievements
• D. Introduced to the WHO by the USSR

Answer: (B)

The essential idea is that eradicating smallpox required a coordinated, multi-pronged approach that combined vaccination with active surveillance and targeted vaccination around detected cases. Vaccination builds immunity, but smallpox has a clear clinical presentation and no asymptomatic carriers, so rapid case finding is feasible. When a case is found, ring vaccination—the vaccination of that person’s contacts and near contacts—creates a protective buffer that stops transmission before it can spread further. This combination of broad immunization efforts plus vigilant surveillance and targeted containment was the engine that interrupted all chains of transmission worldwide, leading to eradication in 1980.

Standardizing vaccines contributed to safe and effective delivery, but it isn’t the driving force behind eradication by itself. And while the achievement is widely regarded as one of the most significant public health accomplishments, the decisive factor is the practical, integrated strategy described above. The idea that it was introduced to the WHO by the USSR isn’t accurate; the global effort was led by WHO with broad international collaboration.