Background Understanding the level and characteristics of protection from past SARS-CoV-
2 infection against subsequent re-infection, symptomatic COVID-19 disease, and severe …

Since the onset of the coronavirus disease 2019 (COVID-19) pandemic, multiple severe
acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants with increasing ability to …

Background Most studies of immunity to SARS-CoV-2 focus on circulating antibody, giving
limited insights into mucosal defences that prevent viral replication and onward …

Background Long-term effectiveness of COVID-19 mRNA boosters in populations with
different previous infection histories and clinical vulnerability profiles is inadequately …

Effect of Previous SARS-CoV-2 Infection against BA. 2.75 Infection A test-negative, case–
control study in Qatar showed that previous infection with pre-omicron strains of SARS-CoV …

Background The higher hospitalisation rates of those aged 0–19 years (referred to herein as
'children') observed since the emergence of the immune-evasive SARS-CoV-2 Omicron …

Summary Background Protection against SARS-CoV-2 symptomatic infection and severe
COVID-19 of previous infection, mRNA two-dose vaccination, mRNA three-dose vaccination …

COVID-19 has taken a severe toll on the global population through infections,
hospitalizations, and deaths. Elucidating SARS-CoV-2 infection-derived immunity has led to …

Summary Background Since early 2022, Omicron BA. 1 has been eclipsed by BA. 2, which
was in turn outcompeted by BA. 5, which displays enhanced antibody escape properties …

Laboratory evidence suggests a possibility of immune imprinting for severe acute respiratory
syndrome coronavirus 2 (SARS-CoV-2) infection. We investigated the differences in the …