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a university of hong kong study awaiting peer review found the omicron variant infects and multiplies 70 times faster than delta and the original coronavirus strain in human air passages leading to the lungs but it's slowing in infecting the lungs. researchers say this could appear why it spreads so rapidly but why most cases are mild. another study shows the booster dose of pfizer's vaccine offers 70% protection about symptomatic covid infection with those that received two primary doses of the mrna vaccine. although u.s. health officials are urging everybody to get booster shots, the cdc still considers those that have received their primary doses to be fully vaccinated. >> we're continuing to follow