Importance Estimates of the rate of waning of vaccine effectiveness (VE) against COVID-19 are key to assess population levels of protection and future needs for booster doses to face …
Abstract SARS-CoV-2 Omicron BA. 1 and BA. 2 subvariants are genetically divergent. We conducted a matched, test-negative, case-control study to estimate duration of protection of …
Background The protection conferred by natural immunity, vaccination, and both against symptomatic severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection with …
JM Ferdinands, S Rao, BE Dixon, PK Mitchell… - Bmj, 2022 - bmj.com
Objective To estimate the effectiveness of mRNA vaccines against moderate and severe covid-19 in adults by time since second, third, or fourth doses, and by age and …
P Relan, NV Motaze, K Kothari, L Askie… - BMJ Global …, 2023 - gh.bmj.com
Objectives To compare severity and clinical outcomes from Omicron as compared with the Delta variant and to compare outcomes between Omicron sublineages. Methods We …
Importance The Omicron variant is phylogenetically and antigenically distinct from earlier SARS-CoV-2 variants and the original vaccine strain. Protection conferred by prior SARS …
Z Zhou, Y Zhu, M Chu - Frontiers in immunology, 2022 - frontiersin.org
Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), is a threat to the health of the global population. As the result …
P Paul, A El-Naas, O Hamad, MA Salameh… - Human Vaccines & …, 2023 - Taylor & Francis
Despite widespread mass rollout programs, the rapid spread of the SARS-CoV-2 Omicron variant called into question the effectiveness of the existing vaccines against infection …
BACKGROUND Protection offered by five different forms of immunity, combining natural and vaccine immunity, was investigated against SARS-CoV-2 Omicron symptomatic BA. 1 …