Three Drosses News Today

Meanwhile, in the fight to contain the omicron variant, they say two doses may not be significant but a booster shot offers significant protection against the variant. nbc news correspondent tom costello has the latest. >> reporter: the new research from pfizer is critical as the country tries to arrest the spread of the omicron variant. pfizer says its first two vaccine doses do not hold up well against omicron, but the third shot, the booster, provides 25 times the booster against omicron. >> ...