In the United States, the omicron subvariant BA.2 accounted for 35% of SARS-CoV-2 infections in the week ending March 19, according to the CDC.
Experts said it is unclear whether the increasing prevalence of the subvariant will result in a COVID-19 surge. It was the top story in infectious disease last week.
Another top story was about a recent decline in tuberculosis in the U.S., which may indicate that the disease is being underdiagnosed.
Read these and more top stories in infectious disease below:
COVID-19 surge from BA.2 not certain in US, experts say
CDC data show that the omicron BA.2