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Officials such as dr. anthony fauci saying the reality is most of us will get omicron, it is so highly transmissible, is there an argument to test only when you're symptomatic or have health conditions that make you particularly vulnerable to severe illness, is there an argument for that rather than testing everyone regardless of symptoms or health conditions? >> it depends on the -- what the goal is here, jim. if the goal is to actually try to contain covid-19, then we should be testing people who are asymptomatic, we know you are maximally infectious one to two days before you develop sympto...

>> you have been exposed to the coronavirus and need to quarantine, there is a different guidance for people who are vaccinated and boosted than for the unvaccinated. but if you are infected and need to isolate, the recommendations don't change depending on whether you're vaccinated or not. can you explain that for us? >> yeah, if you're infected, you're infected. whether or not you're vaccinated or not vaccinated, you're infected. when you talk about exposure and quarantine, if you are a person who is vaccinated but not boosted versus a person who is not vaccinated, because of the greater deg...

Impacting air travel as we were just talking about. and all other aspects of life as well. i want to bring back msnbc medical contributor dr. kavita patel to answer some of your covid questions that you have tweeted at me. so, let's get to it, dr. patel, because we got a lot of them. let me ask the first question here, which is, what percentage of covid vaccines actually prevent infection? eight family members, one tested positive, three others negative, the rest have no symptoms, no test. all adults, vaccinated and boosted. 2 and 6-year-old not vaccinated but no symptoms. >> yeah, yasmin, we'...

I think just to put a little bit of a finer point on it, though, what do you do if you're a family? i think schools across the country are doing different things but i could -- i can't stress this enough. i know some parents are still in places where there is no mask requirement. i strongly encourage everyone to get their children into a high-quality mask, especially the unvaccinated one. >> okay, so, let's talk through a couple things here because you bring up this idea of the rapid at-home tests not being as sensitive to the omicron variant. do we know why? essentially what you're saying, th...

Well do it now, right? >> right. i think there are a lot of people including a lot of previously cautious individuals saying, well, if i'm going to get additional immunity from omicron and vaccinated and boosted, so i won't get that sick, why not get it over with and i can do whatever i want to for a brief period of time. while i understand the rational behind that argument and the wariness, that's driving people asking this question, i think there is a societal argument of preserving hospitals and also individual argument as well as in nobody really wants to get sick, nobody wants to be out o...