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4 days ago · While the overall effectiveness of Omicron bivalent vaccination has been described 23,29,30,31, we show that the cross-neutralization of the BA.2-descendent Omicron variant XBB.1.5, which was ...
14 hours ago · Most patients with SARS-CoV-2 were identified in December 2021 and January 2022, approximately reflecting the time period during which Omicron was the dominant circulating variant and COVID-19 ...
1 day ago · The FLiRT strains are subvariants of Omicron. One of them, KP.2, accounted for 28.2% of COVID infections in the United States by the third week of May, making it the dominant coronavirus variant in the country; another, KP.1.1, made up 7.1% of cases. Some experts have suggested that the new variants could cause a summer surge in COVID cases.
2 days ago · A new Covid-19 variant is now the dominant strain: KP.2. It’s part of a subset of variants nicknamed “FLiRT,” and a close descendant of JN.1, a subvariant of Omicron. FLiRT made up a small percentage of cases in mid-March to more than a quarter of all Covid cases in the U.S. Virologists say FLiRT has some differences in its spike protein ...
1 day ago · Background While numerous studies have evaluated the real-world performance of rapid antigen tests (RATs), data on the effect of Omicron sublineages such as XBB and reinfections on RAT performance is limited. We assessed the performance of RATs and factors associated with RAT-negative results among individuals who tested SARS-CoV-2-positive by reverse transcription-polymerase chain reaction ...
5 days ago · A recent review hinted that despite Omicron’s higher transmissibility, myocardial infarction was less common in Omicron-infected patients, both in vaccinated and unvaccinated groups, compared with those infected with Alpha and Delta strains. 11 Whilst Delta variants exhibited greater virulence and mortality, Antonelli et al. 12 also reported ...
5 days ago · In the lung, the change in the proportion of neutrophils in mice infected with SARS-CoV-2 prototype and Omicron BA.1 was similar over time, increasing significantly from about 20% before inoculation to nearly 60% at 5 dpi, and the high proportion of neutrophils in Omicron BA.1 group was maintained to 7 dpi (Figure 5C).
