Objectives To assess the prevalence of and factors associated with post-coronavirus
disease 2019 (COVID-19) syndrome 6 months after the onset. Methods A bidirectional …

Objectives This study aimed to describe the impact of vaccination and the role of humoral
responses on post–COVID-19 syndrome 1 year after the onset of SARS coronavirus type 2 …

Objective This multicenter study investigated clinical risk factors associated with the number
of long-term symptoms after COVID. Methods Clinical features, symptoms at hospital …

Objectives This study aims to analyze the incidence of Post-acute COVID-19 syndrome
(PCS) and its components, and to evaluate the acute infection phase associated risk factors …

(1) Background. Post-COVID-19 syndrome is defined as the persistence of symptoms after
confirmed SARS-CoV-2 infection.(2) Methods. ANOSVID is an observational retrospective …

Background The relationship of host immune response and viral replication with health
outcomes in patients with COVID-19 remains to be defined. We aimed to characterize the …

Commercially available immunoassays have been developed for sensitive and specific
detection of antibodies against SARS-CoV-2. While a fast and reliable IgG response has …

To assess the persistence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-
2) antibodies produced by natural infection and describe the serological characteristics over …

Background COVID-19 patients may experience “cytokine storm” when human immune
system produces excessive cytokines/chemokines. However, it remains unclear whether …

Background To accurately interpret COVID-19 seroprevalence surveys, knowledge of serum-
IgG responses to SARS-CoV-2 with a better understanding of patients who do not …