A pandemic is defined as ...

• A. An outbreak of disease restricted to a single community.
• B. An outbreak of a disease that occurs on a global scale, affecting a large number of people.
• C. A routine seasonal flu not affecting many.
• D. A hospital-acquired infection.

Answer: (B)

Understanding the scale of spread is key. A pandemic means an outbreak that crosses borders and becomes widespread across many countries or continents, affecting a large number of people and showing sustained transmission globally. This distinguishes it from outbreaks confined to a single community or locale, which are localized and not global in scope. It also differs from a routine seasonal flu, which recurs regularly and may not achieve widespread global impact in a given year. And it isn’t about infections acquired in a hospital setting, which are nosocomial. So the description that emphasizes global reach and a large affected population is the best fit.