Seroprevalence surveys suggest that more than a third and possibly more than half of the
global population has been infected with SARS-CoV-2 by early 2022. As large numbers of …

Abstract The Delta (B. 1.617. 2) variant was the predominant UK circulating SARS-CoV-2
strain between May and December 2021. How Delta infection compares with previous …

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

Under-reporting of COVID-19 and the limited information about circulating SARS-CoV-2
variants remain major challenges for many African countries. We analyzed SARS-CoV-2 …

The avidity index (AI) of IgG to the RBD of SARS-CoV-2 was determined for 71 patients with
a mild (outpatient) course of COVID-19, including 39 primarily and 36 secondarily reinfected …

Background: Knowledge of occupational health is crucial to the safety of healthcare workers
in the pandemic period. The aim of our study was the rating of SARS-CoV-2 seroprevalence …

The presence of neutralizing SARS‐CoV‐2‐specific antibodies indicates protection against
(re) infection, however, the knowledge of their long‐term kinetics is limited. This study …

It is not well investigated whether exposure to specific drug classes is associated with
COVID-19. We investigated the risk of SARS-CoV-2 infection and severe COVID-19 among …

Background Despite declining COVID-19 incidence, healthcare workers (HCWs) still face an
elevated risk of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection …

Background The purpose of this study was to assess whether influenza vaccination has an
impact on the risk of coronavirus disease 2019 (COVID-19). Methods A cohort of 46 112 …