reporter: and tonight, with millions of families on the move for the holiday weekend, amid rising infections, the new whte house covid response g ericans to take shish jha, is those familiar precautions. we know how to gather together safely now. if you re going to see somebody high risk, get a test before you do that. reporter: while the ba.2 subvariant fuels a fresh wave, health authorities are closely tracking two new versions of omicron now making up 90% of new cases in central new york. ba.2.12 and ba.2.12.1 could be about 25% more infectious than ba.2, and experts say they ve been detected in more than 30 states and 40 countries. we don t know yet if it s more contagious, or if potentially has the ability to evade the immune system. either way, we know that they confer a growth advantage, which means that they re spreading rapidly in the community. and erielle joins you now. erielle, the fda tonight granting authorization to a new covid breath test? reporter: that s r