Omicron Breakthrough Cases Boost Protection, Studies Say

Vaccinated people who have a breakthrough case of Omicron will have better protection against COVID-19 variants than vaccinated people who receive a booster shot, two new studies show. The University of Washington, working with Vir Biotechnology of San Francisco, looked at blood samples of vaccinated people who had breakthrough cases of […]

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Omicron BA.1/1.1 SARS-CoV-2 Infection among Vaccinated Canadian Adults

The incidence of the omicron BA.1/1.1 variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which rapidly spread worldwide even among vaccinated persons, is incompletely defined.1 We quantified the incidence of SARS-CoV-2 infection during the initial omicron BA.1/1.1 variant wave among Canadian adults2 and the contribution of previous infection and concurrent vaccination […]

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Four Vaccine Doses Prevented Severe Omicron COVID-19 Better Than 3

Older patients in Israel who received a fourth dose of the BNT162b2 (Pfizer-BioNTech) SARS-CoV-2 vaccine were more than 3 times less likely to develop severe COVID-19 than those who received only 3 doses. But while protection against severe disease did not wane during the testing period, protection against confirmed infection […]

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Infección por ómicron a 20 días de haber padecido delta: el periodo más corto conocido de reinfección por SARS-CoV-2

Durante el European Congress of Clinical Microbiology & Infectious Diseases (ECCMID) de 2022, en Lisboa, Portugal, un grupo de investigadores españoles presentó el interesante caso de una mujer de 31 años que fue positiva a ómicron a solo 20 días de ser positiva a delta. Este tiempo de diferencia entre infecciones es el más corto […]

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Omicron Sublineages Evade Immunity From Past Infection

A South African study based on blood samples found that the BA.4 and BA.5 sub-lineages of Omicron were more likely to evade antibodies produced by previous Omicron infections than the immunity provided by vaccinations. Scientists took blood samples from 39 people infected with Omicron, with 24 people not vaccinated and […]

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Omicron BA.2: What Do We Know So Far?

Since November 2021, the Omicron variant of SARS-CoV-2 has quickly become the most dominant variant worldwide. Early sequencing of Omicron in South Africa alerted researchers to the possibility that Omicron could be a cause for concern due to extensive mutations of the spike protein. Omicron has 30 mutations of the […]

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What to Know About “Stealth” Omicron 

The BA.2 variant, a subvariant of omicron, recently led to a surge in COVID cases in Europe, and now it is the dominant variant in the United States. This week also brought news of two new sub-lineages of BA.2—BA.2.12 and BA.2.12.1—in New York. Once again, we turned to our Institute for Health Metrics and […]

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Subvariantes de ómicron disparan contagios COVID en Nueva York

Dos nuevas subvariantes de ómicron que parecen incluso más transmisibles que el altamente contagioso BA.2 están impulsando un aumento en los casos de COVID en Nueva York, informó el miércoles el departamento de salud del estado. Si bien no hay evidencia de que ninguna de las dos subvariantes cause una enfermedad más grave, […]

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South Asian Ethnic Groups Suffered the Most from Omicron in the UK

In its latest report, the Office for National Statistics (ONS) has updated the ethnic contrasts in deaths involving COVID-19 highlighting how patterns in rates of deaths involving COVID-19 between ethnic groups has changed over the course of the coronavirus pandemic. Their new report covers the period from January 10, 2022 to […]

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