Risk Factors and Clinical Outcomes of COVID-19 Infection in Multiple Sclerosis Patients: A Retrospective Study from a Single Center in Kosovo.

BACKGROUND Multiple sclerosis (MS) is treated with disease-modifying therapies (DMTs) that can increase susceptibility to viral infections. This retrospective study aimed to evaluate the presentation, management, and outcomes of patients with MS on DMTs admitted with symptoms of COVID-19 to a single center in Prishtina, Kosovo between March 2020 and April 2022. MATERIAL AND METHODS In this observational, single-center study, we included 282 patients with MS (mean age 37.8±11, 64.9% females), of whom 272 (96.4%) had confirmed COVID-19 infection, either through the presence of antibodies in the serum or a positive PCR test. RESULTS Most patients with COVID-19 infection were either asymptomatic or mildly symptomatic, while 11 patients were hospitalized due to moderate to severe symptoms. Among those with severe infection, 2 patients have died. Patients with moderate and severe COVID-19 had more advanced MS disease (P=0.001) and higher disability scales (P<0.001). In a logistic regression analysis, advanced MS remained significantly associated with worse symptoms, even after adjusting for other risk factors, with a relative risk (RR) of 2.8 (95% CI=1.1-6.6, P=0.018). MS patients on anti-CD20 DMTs more frequently experienced moderate and severe symptoms (RR=2.1, 95% CI=1.1-4.0, P=0.012). Anti-SARS-CoV-2 IgG was also lower in patients treated with anti-CD20. Notably, patients receiving vitamin D supplementation experienced a lower frequency of moderate to severe symptoms (P=0.007). CONCLUSIONS Patients with advanced MS exhibiting higher disability scales and those on anti-CD20 therapy faced an increased risk of experiencing more pronounced symptoms after COVID-19 infection. Patients on vitamin D supplementation had better clinical outcomes.