Objective To assess the protective effect of previous COVID-19 infection for healthcare
workers in a high-prevalence setting. Method The COVID-19 antibody and PCR results of …

Background: Even though a few years have passed since the coronavirus disease 2019
(COVID-19) outbreak, information regarding certain aspects of the disease, such as post …

Background There is an urgent need to better understand whether individuals who have
recovered from COVID-19 are protected from future SARS-CoV-2 infection. Methods A large …

Introduction: Even though over a year has passed since the coronavirus 2019 (COVID-19)
outbreak, our information regarding certain aspects of the disease, such as post-infection …

Given the overwhelming worldwide rate of infection and the disappointing pace of
vaccination, addressing reinfection is critical. Understanding reinfection, including longevity …

Introduction Understanding the effectiveness and durability of protection against SARS-CoV-
2 infection conferred by previous infection and COVID-19 is essential to inform ongoing …

Introduction Understanding the effectiveness and durability of protection against SARS-CoV-
2 infection conferred by previous infection and COVID-19 is essential to inform ongoing …

Background The overall risk of reinfection in individuals who have previously had COVID-19
is unknown. To determine if prior SARS-CoV-2 infection (as determined by at least one …

Background There is a need to understand the duration of infectivity of primary and recurrent
coronavirus disease 2019 (COVID-19) and identify predictors of loss of infectivity. Methods …

The risk of reinfection could be related to the initial SARS-CoV-2 clinical presentation, but
there are no data about the risk change after SARS-CoV-2 vaccination. We evaluated the …