The clinical course and outcome of COVID-19 are highly variable, ranging from
asymptomatic infections to severe disease and death. Understanding the risk factors of …

The rapid emergence of SARS-CoV-2 variants challenges vaccination strategies. Here, we
collected 201 serum samples from persons with a single infection or multiple vaccine …

Introduction Understanding how spike (S)-, nucleoprotein (N)-, and RBD-directed antibody
responses evolved in mild and asymptomatic COVID-19 in Africa and their interactions with …

Background Data on response and safety of repeated vaccinations and hybrid immunity in
patients with immune-mediated inflammatory diseases on immunosuppressive therapy is …

The virus that causes COVID-19 changes over time, occasionally leading to Variants of
Interest (VOIs) and Variants of Concern (VOCs) that can behave differently with respect to …

Third doses of COVID-19 vaccines were widely deployed following the primary vaccine
course waning and the emergence of the Omicron-variant. We investigated protection from …

Studies investigating the cumulative incidence of and immune status against SARS‐CoV‐2
infection provide valuable information for shaping public health decision‐making. A cross …

We administered BNT162b2 as a third dose to 314 adults aged≥ 30 years who had
previously received 2 doses of inactivated vaccine. We collected blood samples before the …

Informed decisions regarding COVID-19 vaccine administration and pandemic management
strategies have been substantiated by empirical evidence concerning immune responses …

Objectives SARS-CoV-2 remains a global health concern 3 years after its emergence. Safe
and effective vaccines mitigate the pandemic impact, but the optimal schedule remains …