a family or friends or folks outside of your household. joining us now from the l.a. area airport, what are experts saying about masks? does it matter what kind of mask you wear? reporter: kate, health experts say any mask is better than no mask but added n95 or doubling up face coverings will provide better protection. thank you. health experts are saying to be safe this holiday you should get tested before any gathering preferably the same day. that means finding a covid test but it is a challenge to get one with endless lines at clinics today and home kits sold out in a lot of areas. morgan chesky on what is behind the shortage. reporter: tonight from coast to coast, omicron s impact growing by the day. very, very scary. i definitely want to get tested more. i had a couple friends test positive. it is not good. reporter: the rise in cases exposing a drastic dip in testing