so it's always wise to use, you know, one or more of these things if you want to be doubly certain. that most of them only dramatically reduce the risk and i think what we will probably find here is that, you know, there are periods of time when omicron's infectious at the beginning where the antigen test isn't yet able to pick it up. but i think the recommendation will very likely be that you get two antigen tests in a box. take one on a monday, and then take a second one on a tuesday. and that way, you can be much more certain of the results of the test. >> and let's talk about these new cdc isolation guidelines. the nation's largest nurse's union is saying -- and we -- this is a quote here -- this is about what's good for business, not what's good for public health. the biggest flight attendants' union is saying, quote, we cannot allow pandemic fatigue to lead to decisions that extend the life of the pandemic or put policies on the backs of workers. do these organizations have a point? >> well, look.