Demographic changes and behavioural responses shape vulnerability to infectious disease outbreaks.

Population aging in Republic of Korea by 2050 may decrease outbreak risk, but behavioral changes can offset this effect, complicating infectious disease predictions.

• Why it matters: Understanding how demographic shifts influence disease spread is crucial for preparing effective public health responses amid changing population structures and behaviors.
• What they did: Aging-related contact patterns and behavioral adaptations, such as extended workforce participation, were modeled using an age-structured mathematical approach to estimate outbreak probabilities.
• The result: Findings suggest that demographic and behavioral factors jointly shape outbreak risks, emphasizing the need to incorporate socio-demographic context into future infectious disease risk assessments.