XBB.1.5, which is a subvariant of omicron, now accounts for more than 27.6% of confirmed COVID-19 cases in the United States and over 70% of confirmed cases in the Northeast, according to the most ...

In recent months, there have been a hodgepodge of what I’ve been calling the “scrabble” variants (because they tend to use high-value scrabble letters such X, B, Q, F). The precursor to XBB ...

XBB is a relatively recent addition to the alphabet soup of highly contagious but seemingly less-severe omicron offshoots. It’s what’s known as a recombinant variant, or a strain made up of ...

In late fall, the subvariants B.Q.1 and B.Q.1.1 together became the predominant form of the virus in the United States. They are not alone — other omicron subvariants including XBB, BF.7 and yes ...

According to the health organisation, XBB is a recombinant of BA.2.10.1 and BA.2.75 sublineages. It has a global prevalence of 1.3% and it has been detected in 35 countries. It noted "some early ...