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Increase in that immunity that we are looking for. and we see that both moderna and johnson & johnson were approved to move forward. >> so, they all had relatively impressive efficacy rates. johnson & johnson had one at 72% versus moderna and sizer, 94 and 95%. now, to understand that, with a booster, johnson & johnson is 100% with efficacy. now, that's pretty impressive. and if that's the case, you know, many people are kind of wondering why didn't they just use two dose from the beginning. >> that's such a great question, fred. and one of the reasons is that, you know, the bar for vaccinatio...

People have received one dose of johnson & johnson would be better off receiving an mrna vaccine probably more specifically moderna if they get a third shot. >> what about the people that have pfizer, would it be okay to get a moderna booster shot then? >> that is what we are going to see today and tomorrow as the fda officials review the data. right now, we know that only a pfizer booster is approved for people who have received pfizer for their primary series but we may eventually see that you can receive any other vaccine as a booster in the follow-up. we'll see what the data shows. >> talk...

But the real sit i'm not and i don't think very many of us are. and we just want to have our lives back. >> the leading theory is that this could be similar to a technology that russia had used during the cold war to spy on the u.s. embassy. later used to collect data from computers and cell phones, but now a hostile country may have turned it into a weapon. russia as well as cuba deny any involvement. andrea mitchell, nbc news, washington. >> wow. that wraps up this hour. i'm stephanie ruehl. >> good morning it's 10:00 a.m. eastern, 7:00 a.m. pacific. we're following the latest developments o...

Effective. for more on this and other covid news i'm joined by cal perry, nbc news correspondent and meagan fitzgerald also an nbc news correspondent in chicago. meagan, explain what the study means when it says it's okay to mix and match covid boosters. >> reporter: so jose, what this nih study says is that it's safe and this has not been peer reviewed but for example if you received the moderna vaccine it's safe to get a pfizer booster shot and vice versa, if you had pfizer you can get a moderna shot. what's interesting here, as it relates to those who got the johnson & johnson shot, it says...

Confusion over boosters. tell us what we need to know about the third shot. >> so it's called a booster but it may be a third dose. we're learning so much about vaccines and it may be another primary series includes a third dose. so far we have the pfizer vaccine approved for a booster, and most likely we'll see boosters for both moderna and johnson & johnson. the outstanding question is what is the follow-up booster from johnson & johnson, given that mix and match study has shown that a follow-up dose of moderna produces the strongest immune response. >> isn't the technology different in the ...