By Raghav Mahobe and Julie Steenhuysen (Reuters) -Over 40% of COVID-19 cases in the United States are now caused by the highly contagious Omicron XBB.1.5, data from the U.S. Centers for Disease…
COPENHAGEN – The BA.2 subvariant of the Omicron coronavirus variant, which has quickly taken over in Denmark, is more transmissible than the more common BA.1 and more able to infect vaccinated people,…