XBB.1.5 Covid variant has caused a huge rise in new cases in which country?

Correct Answer: C. USA

US Centers for Disease Control and Prevention estimates that XBB.1.5 has more than doubled its share of the Covid-19 figures each week.
In the Northeast region of the country, XBB.1.5 is causing 75% of new cases. The XBB.1.5 strain is a relative of the Omicron XBB variant, which is a recombinant of the Omicron BA.2.10.1 and BA.2.75 subvariants.