through more states. what do we know? >> and it's been going on since mid june, as well. so people hearing about this maybe now for the first time. but it's been out there for some time. and it's been a little bit slow in terms of figuring this out. having covered a lot of these types of outbreaks, usually you have a better handle on this. but right now they don't have a clear idea what is causing this. you put up that map there, three of those states have the most cases. iowa, nebraska, texas. but there is about 353 people who have been sickened. probably more people that have symptoms but haven't gone to their doctor. and then you have some who have been hospitalized. no one has died yet, but this is of significant concern. a bit of a whodunit. these are how the medical investigations often work and it's not really morning show kind of stuff to describe, but the symptoms are pretty awful. there is a treatment for this. so if people have symptoms and they're worried about it, they can go to their doctor and get a very effective treatment.