We present an interim analysis of a registered clinical study (NCT04800133) to establish
immunobridging with various antibody and cellular immunity markers and to compare the …

Background Individuals with a prior Severe Acute Respiratory Syndrome Coronavirus 2
(SARS-CoV-2) infection have a moderate to high degree of protection against reinfection …

The coronavirus disease 2019 (COVID-19) has been a challenge for the whole world since
the beginning of 2020, and COVID-19 vaccines were considered crucial for disease …

In 1918 many countries, but not Spain, were fighting World War I. Spanish press could report
about the diffusion and severity of a new infection without censorship for the first-time, so that …

Objectives We estimated vaccine effectiveness (VE) of primary and booster vaccinations
against SARS-CoV-2 infection overall and in four risk groups defined by age and medical …

It is not well-described how the acute symptoms of infection with severe acute respiratory
syndrome coronavirus 2 (SARS-CoV-2) differ by variant, vaccination, sex and age. A cross …

The rapid emergence of immune-evading viral variants of SARS-CoV-2 calls into question
the practicality of a vaccine-only public-health strategy for managing the ongoing COVID-19 …

We carried out a cohort study on the overall population of the province of Pescara, Italy, to
assess the real-world effectiveness of SARS-CoV-2 vaccination against infection, severe, or …

The question of COVID-19 and long-COVID-19 course in children remains unsolved. This
infection in children, which is associated with COVID-19, can vary from asymptomatic to …

Objective We aimed to systematically evaluate the effectiveness of the currently available
mRNA vaccines and boosters for the Omicron variant. Methods We searched for literature …