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 […]
Créditos: Comité científico Covid
Coronavirus reinfections will likely increase throughout the summer as two Omicron subvariants — BA.4 and BA.5 — become dominant in the U.S. The subvariants appear to be escaping immunity from vaccines and previous infections — even other Omicron infections — and have been causing hundreds of thousands of new COVID-19 […]
The two newest subvariants of Omicron, BA.4 and BA.5, are spreading across the U.S. and making up a higher percentage of new cases, prompting concerns about increased transmissibility. The subvariants represent 13% of new COVID-19 cases, according to the latest CDC data, up from 7.5% the week before and 1% in […]
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 […]
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 […]
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 […]
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 […]
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 […]
Anosmia, the loss of smell, is a frequent and often long-term symptom associated with COVID-19 that can severely burden a person’s quality of life, making it extremely difficult to taste foods, detect airborne hazards in the environment, and carry out other functions dependent on the sense. While the devastating impacts […]
