Sepsis remains a major, under-recognized killer, and pandemics—including COVID-19—amplify sepsis risk; unless health systems change, this pattern is likely to recur.

Historical lessons show how secondary bacterial infections have driven mortality in influenza pandemics, while COVID-19 exposed antimicrobial resistance risks due to drug shortages.

Actionable steps include pandemic-ready sepsis surveillance codes, stockpiling ventilators and CRRT capacity, securing contracts for antibiotics and critical drugs, advancing rapid point-of-care diagnostics, and mounting public awareness campaigns.

Looking ahead, a highly severe and highly transmissible pathogen would likely cause larger undercoded sepsis spikes, heavier ICU burdens, and higher costs driven by severity.

Viral sepsis differs from bacterial sepsis in that it involves a diffuse, ongoing inflammatory process without a single focal source to target.

From 2016 to 2021, US sepsis hospitalizations rose about 39%, with increases both pre-pandemic and during COVID, while France saw viral sepsis grow from roughly 1% to 10% of sepsis cases during the pandemic.

US sepsis costs climbed roughly 36.5% (from $38.2B to $52.1B), driven largely by COVID-tagged stays; per-stay costs rose about 17%, with severity a bigger cost driver than volume.

In-hospital sepsis mortality rose notably from 2019 to 2021, especially among adults 18–64, with around 36,000 sepsis deaths in 2020 exceeding pre-pandemic trends.

Pandemics reveal systemic readiness failures in ICU capacity, ventilator supply, antibiotics, and supply chains, underscoring that timely treatment is crucial.

The policy takeaway is to treat sepsis readiness as core pandemic infrastructure and leverage lessons from COVID-19 to elevate sepsis care now.

Coding gaps show many COVID-related deaths are undercoded as sepsis (9% coded as sepsis vs 52–93% clinically present), underestimating true impact.

Viruses disrupt lung defenses, enabling secondary bacterial infections; historical pandemics demonstrate coinfections worsen outcomes.