Transcript for Health officials urge people to check immunization records amid measles outbreak
story. The number of measles cases climbing to over 460 patients patients nationwide. Five more patients confirmed in Michigan, bringing the state total to of those patients were Jennifer Ashton is here with what you need to know. What do we need to know? This has been dominating the medical and health headlines and for good reason. This is the single most infectious virus in the world. About 90% of people who are exposed to it, if they have not been vaccinated will become sick. Let's talk about the vaccine. It's about 97% effective after you get the two doses and 93% after a single dose. You are considered protected lifelong, but it is not perfect. You saw that number was 97%, and not 100%. There is a small percentage of people we call nonresponders and that's what appears to be going on in these very, very rare cases of people becoming sick after they know they have been vaccinated. Now you have heard these stories. There are some stories circulating that the vaccine wears off, that you may need a is that -- that's really the most important thing about this. We are seeing with this national outbreak, so much myth, misinformation. Yeah. Miseducation. It is making people sick. So again, the CDC is all over this. They are saying to people, again, this vaccine does not wear off. You don't need a booster, but there is also talk of, should I get tested? Should I get this blood test to see if I'm protected? The answer is no. Number one, that test was designed to see if you have been naturally exposed. That's different than vaccine protection, and it's expensive, and, you know, for the rare people who might get that test result back and it shows no immunity, they're going to be left with saying, what do I do? This really pertains to medical professionals and health care providers who need to make sure. The key here, 1957, if you were born before that, you are presumed to have been naturally exposed. The people after that, are protected with the vaccine. Okay. We haven't had to deal with this in a very, very long time. That's right. Let's take a history and medical walk down memory lane and realize that this is not just a we can see this. So take a look at these numbers, robin, of children who are infected with measles. 1 in 10 will develop an ear infection that could lead to deafness. 1 in 20 will develop pneumonia that could require icu support. 1 in 1,000 will cause brain swelling which could be deadly, and 1 to 2 out of 1,000 children will die of measles. You don't want to go far back in the history books. 2017, over 100,000 people worldwide died of measles. We take this seriously. Thank you, Jen, very much. I'll see you later and we'll do a podcast? It's coming out. We'll be talking about it.
This transcript has been automatically generated and may not be 100% accurate.