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united states. we'll look at whether there is any relief in sight. and children as young as six months old just days away from getting covid shots. >> live from cnn center, this is "cnn newsroom" with kim brunhuber. we're tracking developments in ukraine where the area around the capital kyiv was rattled by a series of explosions a short time ago. air defenses worked on enemy targets, but so far no fires or casualties reported. officials are urging people to stay in shelters. meanwhile two european leaders say the war may drag on for years. boris johnson and jens stoltenberg made...

Don't understand the process for what the trials do. the vaccine was not found to be ineffective in two to four-year-old group. what happened was the pfizer sets a threshold for antibody response and what happened was it did not meet that threshold. it doesn't mean it's not effective. it just means it didn't hit the market they wanted it to compared to the six month and two-year-olds where it did. it is not that the vaccine doesn't work. it is not that the vaccine doesn't protect that age group. but considering how many hundreds of thousands of kids have been recently infected, how many hundre...

The holiday season and the winter months. >> how quickly does protection begin to wane though, doctor, following a moderna booster dose? >> so, wolf, i think we're still looking at those data. probably from about three months on against omicron, after the second dose of the primary vaccination you'll begin to get some waning. now people are getting boosted and i think we'll have to wait a couple months until we can see how the data develop and mature to understand when will their additional booster dose if needed have to be given? >> we know that people do fare better. correct me if i'm wrong....

Help you fight omicron, or how much it would help you fight omicron. let's look at basic results. moderna is saying their current booster, which is 50 micro grams, that it boosted antibodies. they said 100 micrograms, double the dose, boosted antibodies even higher which brings into question, should they have made it 100 micro grams. but the effectiveness is unclear. just because it boosted antibodies does not necessarily mean that it's going to help you in your fight against omicron. but i think the bottom line, the sort of take-home message for all of us stays the same. get vaccinated of cou...

Need to know. what is it? >> oh, victor, there is a lot. it's not entirely clear how effective or if it's really all that effective, this booster, that moderna is putting out now. the 50 micro gram booster that you can get at pharmacies. it gets complicated. let me lay it out. let's take a look at what moderna said. moderna said when they looked at their current booster, 50 micro grams, that's what you can get going to a pharmacy or whatever. it did boost antibodies, but 100 micro grams boosted antibodies even higher, and the effectiveness of either dose against omicron is unclear. just becaus...