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A particular covid treatment due to a more contagious subvariant. the food and drug administration says that the monoclonal antibody treatment called sotromivab has been successful keeping people out of the hospital but does not seem to help people who contracted the omicron subvariant, known as ba2. the fda says ba2 is now the dominant strain in at least eight states, two territories, and is rising elsewhere. it's also driving a surge in cases in parts of europe, particularly the uk, germany, and the netherlands. and joining us now is anne rimoin. she is a professor in the epidemiology depart...

Transmissible. maybe even 50 to 60% more transmissible but it does not appear to cause more severe disease, so that's good news. >> very good news. and look, we know that cases caused by ba2 remain relatively high, relatively speaking, across asia. there is also this new wave of ba2 infections happening across europe and we are starting to see a rise in ba2 cases in the u.s. um, is this going to be another surge in the u.s. some? >> well, not really, no. what we are starting to see here in the united states and in northern -- in north america, in general -- is an uptick in wastewater surveilla...

Disease, hospitalization, and death in most people. n now, immunocompromised people need to be very vigilant about getting these doses as they are recommended but we are still looking at the data and trying to understand how important is this next dose? when does it need to happen? and what kind of long-term benefit are we going to see? so, we are still looking at the data but it's great that these doses are going to be available. i think that is a very prudent thing to do, given that even if ba2 -- this omicron subvariant -- doesn't create a very large wave, this virus is going to continue to...

Infected with the omicron variant. the big question is is if you have had omicron, will you get reinfected with this ba2 subvariant? and the answer is it's possible. data study recently in -- in preprint, not yet peer-reviewed, has suggested that you can get reinfected from ba1 to ba2. those -- though those reinfections are rare. >> all right. professor anne rimoin, we will leave it at that. thank you so much for lending your expertise to our audience. take care. >> my pleasure. you are watching "cnn newsroom." up next, firefighters in the u.s. -- they want to help colleagues in ukraine who ...