Background
As of July 2020, COVID-19 has caused 500,000 deaths worldwide. However, large-scale studies of
COVID-19 mortality and new-onset comorbidity compared to influenza and individuals tested
negative for COVID-19 are lacking. We aimed to investigate COVID-19 30-day mortality and newonset comorbidity compared to individuals with negative COVID-19 test results and individuals
tested for influenza.
Methods and findings
This population-based cohort study utilized electronic health records covering roughly half
(n=2,647,229) of Denmark's population, with nationwide linkage of microbiology test results and
death records. All individuals ≥18 years tested for COVID-19 and individuals tested for influenza
were followed from November 1, 2017 to June 30, 2020. The main outcome was 30-day mortality
after a test for either COVID-19 or influenza. Secondary outcomes were major comorbidity
diagnoses 30-days after the test for either COVID-19 or influenza. In total, 224,639 individuals
were tested for COVID-19. Among inpatients positive for COVID-19, 356 of 1657 (21%) died
within 30 days, which was a 3.0 to 3.1-fold increased 30-day mortality rate, when compared to
influenza and COVID-19-negative inpatients (all p<0.001). For outpatients, 128 of 6,263 (2%)
COVID-19-positive patients died within 30 days, which was a 5.5 to 6.9-fold increased mortality
rate compared to influenza and COVID-19-negative patients, respectively (all p<0.001). Compared
to hospitalized patients with influenza, new-onset ischemic stroke, diabetes and nephropathy
occurred more frequently in inpatients with COVID-19 (all p<0.05).
Conclusions
In this population-based study comparing COVID-19 with influenza, COVID-19 was associated
with increased rates of major systemic and vascular comorbidity and substantially higher mortality,
which is likely even higher than the stated 3.0 to 5.5-fold increase owing to more extensive testing
for COVID-19.