Introduction A precise estimate of the frequency and severity of SARS‐CoV‐2 reinfections
would be critical to optimize restriction and vaccination policies for the hundreds of millions …

Background A correlate of protection (CoP) is an immunological marker associated with
protection against infection. Despite an urgent need, a CoP for SARS-CoV-2 is currently …

Background The effectiveness of SARS-CoV-2 vaccines in older adults living in long-term
care facilities is uncertain. We investigated the protective effect of the first dose of the Oxford …

Background Long-term care facilities (LTCFs) have reported high SARS-CoV-2 infection
rates and related mortality, but the proportion of infected people among those who have …

Current data suggest that SARS-CoV-2 reinfections are rare. Uncertainties remain, however,
on the duration of the natural immunity, its protection against Omicron variant, and on the …

This mixed design synthesis aimed to estimate the infection fatality rate (IFR) of Coronavirus
Disease 2019 (COVID-19) in community-dwelling elderly populations and other age groups …

Importance A surge of COVID-19 occurred from March to June 2021, in New Delhi, India,
linked to the B. 1.617. 2 (Delta) variant of SARS-CoV-2. COVID-19 vaccines were rolled out …

Despite over 140 million SARS‐CoV‐2 infections worldwide since the beginning of the
pandemic, relatively few confirmed cases of SARS‐CoV‐2 reinfection have been reported …

Background Understanding the duration of protection and risk of reinfection after natural
infection is crucial to planning COVID-19 vaccination for at-risk groups, including care home …

Objectives To investigate serological differences between SARS-CoV-2 reinfection cases
and contemporary controls, to identify antibody correlates of protection against reinfection …