and nearly all of them are being caused by the omicron ba.2 variant. in just the past two weeks, cases have increased by 24% nationwide. they're rising fastest in the northeast. like in philadelphia, where a 50% surge isn't infections has led officials to bring back indoor mask requirements. the fda has granted emergency use authorization this week for the first covid breath test. >> breathalyzer is what they're talking about. it's a testing device about the size of carry-on luggage. can used in doctors offices and mobile sites. >> christi and alex, this is welcome news for people who don't like using the naval swabs but a positive test result using a breath test should still be confirmed by a nasal pcr test.