"BA.4 and BA.5 have potential to result in a new infection wave," according to researchers in South Africa, where the variants are spreading rapidly.
While the subvariant does not lead to serious illness, it does appear to be more contagious than previous Omicron variants.
An Omicron crisis is coming to North Korea. It's time for the Supreme Leader to accept help.
The study is small but adds to data finding benefits of mix-and-match boosting.
Here's where you're most at risk for getting a COVID infection right now, according to experts.
The large study, published in Research Square, is yet to be peer-reviewed
In the first quarter, cash remittances amounted to $7.77 billion.
Coronavirus Update: Omicron infections no less severe than earlier virus strains
Infected children had significantly more asthma visits, hospitalizations, emergency inhaler use, and steroid treatments
Coronavirus Update: Deaths among vaccinated people rose as omicron spread