VaccinesJul 27, 2026

Six Years of COVID-19: Insights from Tracking the Spread, Vaccine Efforts, Risk Assessment, and Blood Clot Monitoring

Long Covid Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Jul 28, 2026

Abstract

COVID-19 continues to pose challenges for vulnerable populations, particularly older adults and those with multiple comorbidities.

The transition from pandemic to endemic has reduced severe disease burden but COVID-19 still significantly impacts at-risk groups.
Vaccination has lowered rates of hospitalization, intensive care admission, and mortality associated with COVID-19.
Evolving surveillance priorities now include monitoring viral variants, vaccine effectiveness, waning immunity, and long COVID.
Integrated clinical risk stratification considering factors like age, frailty, and thromboembolic risk is essential for managing COVID-19.
Thrombotic complications remain significant for both acute management and follow-up care of COVID-19 patients.
Future surveillance should encompass a broader scope, including vaccine impact and preparedness for emerging variants.

Simplified

Six years after the emergence of SARS-CoV-2, COVID-19 remains a dynamic public health challenge shaped by viral evolution, heterogeneous population immunity, changing vaccine strategies, and the long-term consequences of acute infection. Although the transition from pandemic emergency to endemic circulation has reduced the global burden of severe disease, COVID-19 continues to affect vulnerable populations, particularly older adults, frail patients, immunocompromised individuals, and subjects with multiple comorbidities. Vaccination has substantially modified the clinical course of infection, reducing hospitalization, intensive care admission, and mortality, while also reshaping surveillance priorities toward variant monitoring, vaccine effectiveness, waning immunity, breakthrough infections, and long COVID. At the same time, the pandemic has highlighted the need for integrated clinical risk stratification, including age, sex, frailty, inflammatory biomarkers, respiratory support requirements, and thromboembolic risk. Venous and arterial thrombotic complications have represented a key feature of severe COVID-19 and remain relevant for both acute management and post-discharge follow-up. This narrative review summarizes the main lessons learned from six years of COVID-19, focusing on epidemiology, vaccination campaigns, clinical risk assessment, thromboembolic complications, and surveillance strategies. Particular attention is given to the need for multidisciplinary and data-driven approaches capable of integrating virological, epidemiological, clinical, geriatric, and vascular medicine perspectives. Future COVID-19 surveillance should move beyond case counting and incorporate vaccine impact, population vulnerability, thrombotic and bleeding complications, long-term outcomes, and preparedness for emerging variants.

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Six Years of COVID-19: Insights from Tracking the Spread, Vaccine Efforts, Risk Assessment, and Blood Clot Monitoring

Abstract

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