Vaccinated With Prior Infection Most Protected During Delta Wave

Following the emergence of the Delta variant, individuals who had a prior COVID-19 infection with or without vaccination had lower case rates than those who were vaccinated alone, data from California and New York found. “Infection-derived protection was higher after the Delta variant became predominant, a time when vaccine-induced immunity […]

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COVID-19 survivors have an increased risk of death 12 months post infection

he negative impact of COVID-19 on patients’ health has been recognized but not yet clearly quantified. Previous research has looked at the effects of the disease at 6 months, and scientists have now explored the impact on overall health at 12 months. The relative increase in the risk of death after COVID-19 […]

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Resurgence of SARS-CoV-2 Infection in a Highly Vaccinated Health System Workforce

TO THE EDITOR: In December 2020, the University of California San Diego Health (UCSDH) workforce experienced a dramatic increase in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections. Vaccination with mRNA vaccines began in mid-December 2020; by March, 76% of the workforce had been fully vaccinated, and by July, the […]

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7 Months After Infection, SARS-CoV-2 Antibody Levels Remain Stable or Even Increase

The levels of IgG antibodies against SARS-CoV-2 Spike protein remain stable, or even increase, seven months after infection, according to a follow-up study in a cohort of healthcare workers coordinated by the Barcelona Institute for Global Health (ISGlobal), an institution supported by “la Caixa” Foundation, in collaboration with the Hospital […]

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English Study Finds 50%-60% Reduced Risk of COVID for Double-Vaccinated

LONDON, Aug 4 (Reuters) – Fully-vaccinated people have an around 50 to 60% reduced risk of infection from the Delta coronavirus variant, including those who are asymptomatic, a large English coronavirus prevalence study found on Wednesday. Imperial College London researchers said people who reported receiving two vaccine doses were half […]

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Diagnostic accuracy of rapid antigen tests in asymptomatic and presymptomatic close contacts of individuals with confirmed SARS-CoV-2 infection: cross sectional study

Abstract Objective To assess the diagnostic test accuracy of two rapid antigen tests in asymptomatic and presymptomatic close contacts of people with SARS-CoV-2 infection on day 5 after exposure. Design Prospective cross sectional study. Setting Four public health service covid-19 test sites in the Netherlands. Participants 4274 consecutively included close contacts (identified through test-and-trace […]

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