Until just last December 31, the CDC (Centers for Disease Control and Prevention) revealed that the Ómicron subvariant called XBB.1.5 caused 40% of confirmed cases of COVID-19 in the US.
According to the agency’s most recent data, in the last week of 2022, 40.5% of cases of XBB.1.5 were confirmed; 18.3% of the BQ.1 subvariant; 26.9% of BQ.1.1; and 3.7% from BA.5.
It is worth mentioning that, in the northwest of the country, the XBB.1.5 strain is the one that predominates in 75% of confirmed cases, according to the CDC.
As of December 30, 2022, there was a daily average of 42,140 hospitalizations, in last week’s count. This represented an increase of 4.2% over the previous two weeks.
In the same analysis, the agency assured that SARS-CoV-2, the virus that causes COVID-19, constantly changes and accumulates mutations in its genetic code over time, so new variants are expected to continue to emerge. of SARS-CoV-2.
“Some variants will rise and fall, while others will rise and continue to spread and may replace earlier variants,” the CDC revealed.
To identify and track SARS-CoV-2 variants, CDC uses genomic surveillance. The CDC’s national genomic surveillance system collects virus samples “for sequencing through the National SARS-CoV-2 (NS3) Strain Surveillance Program, as well as sequences from it generated by CDC-contracted commercial or academic laboratories.” and the state or local public health laboratories”, according to the deployment.
According to experts, adults over the age of 65 tend to be more vulnerable to any form of COVID-19 in the US; however, only 37.5% of the group have received a booster vaccination.
Due to this, specialists assure that to avoid any form of contagion of the XBB.1.5 subvariant or others, it is necessary to be immunized again with bivalent vaccines, with the aim of strengthening the immune system.