The clinical course and outcome of COVID-19 are highly variable, ranging from
asymptomatic infections to severe disease and death. Understanding the risk factors of …

Nearly four years after its first appearance, and having gone from pandemic to endemic, the
SARS-CoV-2 remains out of control globally. The purpose of this study was to evaluate the …

Hypovitaminosis D has been associated with worse outcome in respiratory tract infections,
with conflicting opinions regarding its role in Coronavirus-19 disease (COVID-19). Our study …

Early epidemic reports have linked low average 25 (OH) vitamin D levels with increased
COVID-19 mortality. However, there has been limited updated research on 25 (OH) vitamin …

Objectives This study aimed to investigate the association between vitamin D deficiency
(VDD) and post-acute outcomes of severe acute respiratory syndrome coronavirus 2 (SARS …

Calcitriol and hydroxyderivatives of lumisterol and tachisterol are secosteroid hormones with
immunomodulatory and anti-inflammatory properties. Since the beginning of the COVID-19 …

A few patients who have recovered from COVID-19 develop persistent or new symptoms that
last for weeks or months; this is called “long COVID” or “post-COVID-19 syndrome.” Over …

Objectives Concentrations of neopterin, kynurenine and kynurenine/tryptophan ratios predict
prognosis and the need for oxygen therapy in patients hospitalized for severe acute …

Vitamin D deficiency has been studied in the context of acute coronavirus disease 2019
(COVID-19), revealing associations with increased severity and mortality. Yet, the influence …

Background and Objectives There is still incomplete understanding of the pathogenesis of
COVID-19. Calcitriol, the main form of vitamin D in serum, regulates immune responses and …