Largest concentrations of XBB subvariants remain in the Northeast, but holidays may change that soon
show that “XBB” coronavirus subvariants — especially one tagged “XBB.1.5” — are fast becoming the most prevalent types circulating in the United States. But that is not yet the case in San Diego County or most of the West.of coronavirus genetic surveillance, posted this week by SEARCH, a consortium of local research labs, indicates that 8 percent of genetic material decoded from wastewater samples taken on Dec. 28 are XBB strains.
able to evade existing immune system protections by recombining the genetic characteristics of two previous Omicron types.that XBB, so far, has not shown “substantial differences in disease severity,” meaning that as has been the case for other Omicron predecessors, this latest threat is not likely to signal a return to the high rates of hospitalization and death experienced with original types circulating when the COVID-19 pandemic began.
“The evidence is showing that these updated boosters do provide some protection, even against this new variant that is spreading so quickly,” Shah said.
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