Robust T cell responses have been associated with milder outcomes in many infections. T
cells also establish long-term memory pools and, as they are predominantly directed toward …

Background Data on the rate and severity of SARS-CoV-2 reinfections in real-world settings
are scarce and the effects of vaccine boosters on reinfection risk are unknown. Methods In a …

Serum neutralizing antibodies (nAbs) induced by vaccination have been linked to protection
against symptomatic and severe coronavirus disease 2019. However, much less is known …

Vaccination, especially with multiple doses, provides substantial population-level protection
against COVID-19, but emerging variants of concern (VOC) and waning immunity represent …

Background The protective effectiveness provided by naturally acquired immunity against
SARS-CoV-2 reinfection remain controversial. Objective To systematically evaluate the …

Background Most studies of immunity to severe acute respiratory syndrome coronavirus 2
(SARS-CoV-2) measure antibody or cellular responses in blood; however, the virus infects …

Importance The impact of the SARS-CoV-2 pandemic on children remains unclear. Better
understanding of the burden of COVID-19 among children and their risk of reinfection is …

Background The COVID-19 pandemic has had a devastating impact on the world over the
past two years (2020-2021). One of the key questions about its future trajectory is the …

Variants of concern (VOC) of SARS-CoV2 and waning immunity pose a serious global
problem. Overall, vaccination and prior infection appear to provide significant protection to …

Background Much of the world's population has been infected with SARS‐CoV‐2. Thus,
immunity from prior infection will play a critical role in future SARS‐CoV‐2 transmission. We …