Since the beginning of 2020, the entire global health care system has been severely
challenged by the outbreak of coronavirus 2019 disease (COVID-19). Robust evidence has …

The COVID‐19 pandemic caused relatively high mortality in patients, especially in those
with concomitant diseases (ie, diabetes, hypertension, and chronic obstructive pulmonary …

Objective To determine the effect of population level implementation of a test-and-treat
approach to correction of suboptimal vitamin D status (25-hydroxyvitamin D (25 (OH) D)< 75 …

Background Despite circumstantial evidence for aerosol and fomite spread of SARS-CoV-2,
empirical data linking either pathway with transmission are scarce. Here we aimed to assess …

Objective To determine if daily supplementation with cod liver oil, a low dose vitamin D
supplement, in winter, prevents SARS-CoV-2 infection, serious covid-19, or other acute …

Antibody responses to SARS-CoV-2 vaccines vary for reasons that remain poorly
understood. A range of sociodemographic, behavioural, clinical, pharmacologic and …

Objective This work aims to review and discuss controversial topics in the field of vitamin D,
SARS-CoV-2 infection, and COVID-19. Methods The International Conferences …

Background Prospective population-based studies investigating multiple determinants of pre-
vaccination antibody responses to SARS-CoV-2 are lacking. Methods We did a prospective …

Introduction The impact of acute COVID-19 on people with asthma appears complex, being
moderated by multiple interacting disease-specific, demographic and environmental factors …

Importance Current data identifying COVID-19 risk factors lack standardized outcomes and
insufficiently control for confounders. Objective To identify risk factors associated with COVID …