Masking and social distancing in South Korea accidentally saved nearly 50,000 people from dying of non-COVID respiratory diseases.
April 24, 2026
Original Paper
Collateral Survival: Quantifying the Mortality Co-Benefits of South Korea's COVID-19 Non-Pharmaceutical Interventions
SSRN · 6599300
The Takeaway
Public health measures designed to stop one virus led to a 23 percent drop in deaths from the flu and pneumonia. While the costs of the pandemic were high, these collateral benefits prevented tens of thousands of deaths that would have occurred in a normal year. Humans effectively stopped the transmission of almost every other airborne virus while trying to stop just one. This massive scale of avoided mortality reveals how many deaths are actually preventable through simple interventions. These findings suggest that seasonal shifts in behavior could significantly extend human life expectancy.
From the abstract
This study investigates the collateral mortality benefits of South Korea's nonpharmaceutical interventions (NPIs) against COVID-19 on deaths from non-COVID-19 respiratory diseases. Utilizing a Bayesian Structural Time Series (BSTS) model, we constructed a synthetic control group using non-respiratory causes of death, such as malignant neoplasms and chronic non-communicable diseases. Our analysis of national cause-of-death statistics from January 2016 to December 2023 revealed a significant diver