COVID-19 Linked to Broad Long-Term Morbidity in England

Key Takeaways

• In adults in England, COVID-19 was linked to higher incidence of most assessed longer-term health outcomes across pre-vaccination, vaccinated, and electively unvaccinated settings.
• Post-COVID hazards rose early after diagnosis and remained elevated well beyond the acute illness.
• Relative hazards were consistently greater after hospitalized COVID-19 than after non-hospitalized infection.
• Average relative hazards were lower among vaccinated individuals than among electively unvaccinated individuals.
• In the pre-vaccination cohort, hepatic failure, empyema and pneumothorax, and pulmonary embolism showed the strongest reported associations, while diseases of the teeth and supporting structures and pregnancy-related outcomes were among the weakest.

Months after acute SARS-CoV-2 infection, new diagnoses can emerge across multiple organ systems, complicating follow-up well beyond the initial illness. Whether the initial episode required hospitalization and whether infection occurred before or after vaccination are key lenses for understanding that post-acute burden in England.

Investigators analyzed linked electronic health records (EHRs) for adults in England in the NHS Secure Data Environment in a whole-population linked EHR analysis in England. They defined three cohorts by vaccination era or status: pre-vaccination, vaccinated, and electively unvaccinated.

The cohorts included about 49 million, 37 million, and 11 million adults and evaluated 443, 304, and 99 outcomes, respectively. For each cohort, adjusted hazard ratios (aHRs) compared incidence after COVID-19 diagnosis with incidence before or without COVID-19 diagnosis, overall and by disease severity.

In the long-term phenome-wide consequences of COVID-19 analysis, COVID-19 was associated with increased incidence of 90.3% of assessed outcomes in the pre-vaccination cohort, 86.5% in the vaccinated cohort, and 86.9% in the electively unvaccinated cohort. Hazards peaked in the first four weeks after diagnosis, then declined but remained elevated for up to two years. Average aHRs were 57% higher in unvaccinated than vaccinated individuals, and aHRs were consistently greater after hospitalized than non-hospitalized COVID-19. In the pre-vaccination cohort, hepatic failure, empyema and pneumothorax, and pulmonary embolism were the strongest reported associations, while diseases of the teeth and supporting structures and pregnancy-related outcomes were among the weakest.

The authors concluded that COVID-19 was linked to elevated long-term incidence across a broad range of conditions, particularly after hospitalization, and that these effects were markedly reduced among vaccinated individuals. In this England population, the reported post-acute burden extended across multiple conditions rather than a single organ system.

Clinician Questions

How were post-COVID outcomes compared across vaccination groups in this England analysis?

Investigators used linked EHRs for adults in England, defined separate pre-vaccination, vaccinated, and electively unvaccinated cohorts, and estimated aHRs by comparing incidence after COVID-19 diagnosis with incidence before or without COVID-19 diagnosis.

Which conditions had the strongest and weakest reported associations after COVID-19 in the pre-vaccination cohort?

In the pre-vaccination cohort, hepatic failure, empyema and pneumothorax, and pulmonary embolism were reported as the strongest associations after COVID-19, whereas diseases of the teeth and supporting structures and pregnancy-related outcomes were among the weakest/

Recommended Reading

• For more on diabetes risk after infection: Exploring the Risk of Type 2 Diabetes Following SARS-CoV-2 Infection