{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,6]],"date-time":"2026-04-06T15:48:33Z","timestamp":1775490513088,"version":"3.50.1"},"reference-count":24,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T00:00:00Z","timestamp":1770681600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["TropicalMed"],"abstract":"<jats:p>COVID-19, caused by SARS-CoV-2, is a highly contagious disease with variable clinical presentation. Severe forms are more common in patients with pre-existing chronic conditions. The objective of this study is to evaluate the prognostic value of the Charlson Comorbidity Index (CCI) in relation to disease severity and outcome in hospitalized COVID-19 patients with comorbidities. A retrospective analysis was conducted on 558 patients, hospitalized at the Infectious Diseases Clinic of \u201cSt. Marina\u201d University Hospital, Varna, Bulgaria, between March 2020 and March 2021. CCI score was calculated to estimate 10-year survival probabilities. Prevalent comorbidities were arterial hypertension (78.55%), type 2 diabetes (16.09%), and ischemic heart disease (5.82%). A higher number of comorbidities was associated with increased rates of bilateral pulmonary consolidation (\u03c72 = 6.63, p = 0.010), oxygen therapy needs (\u03c72 = 5.41, p = 0.020), and mortality (\u03c72 = 7.88, p = 0.005). Patients with higher CCI scores had worse outcomes. A CCI score above 5 was common among non-survivors and those with pulmonary consolidation and respiratory failure. The findings confirm that advanced age and multiple comorbidities are strong predictors of poor COVID-19 prognosis. Early CCI calculation at hospital admission would help identify high-risk patients and support timely, targeted medical interventions.<\/jats:p>","DOI":"10.3390\/tropicalmed11020049","type":"journal-article","created":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T17:10:52Z","timestamp":1770743452000},"page":"49","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Prognostic Value of Charlson Comorbidity Index in Patients with COVID-19"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1024-5875","authenticated-orcid":false,"given":"Iliyan","family":"Todorov","sequence":"first","affiliation":[{"name":"Department of Infectious Diseases, Parasitology and Dermatovenerology, Faculty of Medicine, Medical University of Varna, 9002 Varna, Bulgaria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4313-3842","authenticated-orcid":false,"given":"Margarita","family":"Gospodinova","sequence":"additional","affiliation":[{"name":"Department of Infectious Diseases, Parasitology and Dermatovenerology, Faculty of Medicine, Medical University of Varna, 9002 Varna, Bulgaria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2685-7355","authenticated-orcid":false,"given":"Kalina","family":"Stoyanova","sequence":"additional","affiliation":[{"name":"Department of Infectious Diseases, Parasitology and Dermatovenerology, Faculty of Medicine, Medical University of Varna, 9002 Varna, Bulgaria"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"497","DOI":"10.1016\/S0140-6736(20)30183-5","article-title":"Clinical Features of Patients Infected with 2019 Novel Coronavirus in Wuhan, China","volume":"395","author":"Huang","year":"2020","journal-title":"Lancet"},{"key":"ref_2","unstructured":"WHO (2025, October 24). 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