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Omicron

Duration of Shedding of Culturable Virus in SARS-CoV-2 Omicron (BA.1) Infection

The B.1.1.529 (omicron) variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has a shorter incubation period and a higher transmission rate than previous variants.1,2 Recently, the Centers for Disease Control and Prevention recommended shortening the strict isolation period for infected persons in non–health care settings from 10 days to 5 […]

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Coronavirus (COVID-19) Update: FDA Recommends Inclusion of Omicron BA.4/5 Component for COVID-19 Vaccine Booster Doses

On Tuesday, the U.S. Food and Drug Administration’s independent experts on the Vaccines and Related Biological Products Advisory Committee met to publicly discuss whether a change to the current vaccine strain composition of COVID-19 vaccines for booster doses is necessary for the 2022 fall and winter seasons. The COVID-19 vaccines […]

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BNT162b2 Vaccine Effectiveness against Omicron in Children 5 to 11 Years of Age

Abstract BACKGROUND Limited evidence is available on the real-world effectiveness of the BNT162b2 vaccine against coronavirus disease 2019 (Covid-19) and specifically against infection with the omicron variant among children 5 to 11 years of age. METHODS Using data from the largest health care organization in Israel, we identified a cohort […]

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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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