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Progression to Critical Illness and Death in Patients With Breakthrough Hospitalizations
Geehan Suleyman1, Raef Fadel2, Ayman Alsaadi2
1Division of Infectious Disease, Henry Ford Hospital, Detroit, Michigan, USA.
Open Forum Infectious Diseases
|July 13, 2022
Summary
COVID-19 vaccination significantly reduces critical illness and mortality in hospitalized patients. Vaccination offers protection against severe outcomes, though disease severity at admission remains a key predictor of adverse events.
Area of Science:
- Infectious Diseases
- Vaccinology
- Public Health
Background:
- Limited data exists on COVID-19 disease progression and outcomes in vaccinated versus unvaccinated individuals.
- Understanding these differences is crucial for assessing vaccine effectiveness and informing public health strategies.
Purpose of the Study:
- To compare disease progression and outcomes in hospitalized COVID-19 patients who were vaccinated versus unvaccinated.
- To identify factors associated with critical illness and mortality after COVID-19 hospitalization.
Main Methods:
- Retrospective case-control study of symptomatic vaccinated (cases) and unvaccinated (controls) patients hospitalized for COVID-19.
- Inclusion criteria: lab-confirmed COVID-19, hospitalization between December 2020 and September 2021.
- Outcomes assessed: critical COVID-19 illness (ICU admission, invasive mechanical ventilation, 28-day mortality).
Main Results:
- Vaccinated patients were older, had more comorbidities, and were more likely to be immunocompromised.
- However, vaccinated individuals experienced less severe symptoms and were less likely to progress to critical COVID-19 illness (33.3% vs. 45.5%).
- Twenty-eight-day mortality was significantly lower in vaccinated patients (11.0% vs. 24.9%), with vaccination identified as protective (OR, 0.528).
Conclusions:
- COVID-19 vaccination is associated with reduced likelihood of critical illness and increased survival among hospitalized patients.
- Disease severity at presentation independently predicted adverse outcomes, irrespective of vaccination status.
- Findings underscore the importance of vaccination in mitigating severe COVID-19 outcomes.
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