>> the boosters work, and americans should get their booster. there is waning across time. so it's important that people take advantage of the extra protection of a booster shot. >> for more, i'm joined by dr. jorge rodriguez, an internal medicine specialist and viral researcher. good to have you with us. >> thank you so much. thank you for having me. >> this omicron subvariant ba.2 is now here in the u.s., causing more than half of all covid infections last week. more than 70% of infections in the northwest country. what can you tell us about this variant, and could it trigger another surge in cases here like we've seen play out in the uk and other parts of europe? >> well, it certainly can. sort of start another surge here in the united states. and it more than likely will. the only silver lining is that right now in the united states, we're at a very low level of infectivity. so think of that as a hurricane