well, then, after that it gets unpretty. people actually start to develop significant diarrhea. then they start to vomit. but what really is a hallmark of this is that it becomes bloody. the body starts to be unable to clot and as a result you see blooding on the outside but it's the bleeding on the inside that's the most concerning and it can often cause death. it's a difficult thing to test for, and that's part of the problem. in the beginning of outbreaks like this, nobody knows what's happening and that's when people become careless. that's when health care workers start to get infected and that's how something like this starts to spread. here's a very important number, 42. 42 days. that's two incubation periods. if you get to 42 days with no new cases, that's when people will say, okay, this outbreak is over. they got to scour the entire country, the surrounding areas, and make sure there are no new cases, and then it's time to pack it up. and still ahead, i'm going to show you how my crew and i stay safe reporting on a story like this one. we're going to give you exclusive

after that, it gets unpretty. people actually start to develop significant diarrhea.y is a hallmark of this is that it becomes bloody. the body starts to be unable to clot. as a result, you see bleeding on the outside. but it's the bleeding on the inside that's the most concerning and it can often cause death. it's a difficult thing to test for, and that's part of the problem. in the beginning of outbreaks like this, nobody knows what's happening. that's when people become careless. that's when health care workers start to get infected. that's how something like this starts to spread. here's a very important number. 42. 42 days. that's two incubation periods. if you get to 42 days with no new cases, that's when people will say, okay, this outbreak is over. they've got to scour the entire country, surrounding areas, and make sure there are no new cases. and then it's time to pack it up. dr. sanjay gupta, cnn. >> very worrying situation. as sanjay said, 42 days. that's the number they're hoping to get to without any new cases. >>> coming up, the united nations has just

you get a headache, people have fever, they start to feel unwell, tired, but then after that, it's unprettyvomit but what really is a hallmark of this is that it becomes bloody. the body starts to be unable to clot and as a result you see bleeding on the outside but it's a bleeding on the inside that's the most concerning and it can often cause death. it's a difficult thing to test for and that's part of the problem, in the beginning of outbreaks like this, nobody knows what's happening, and that's when people become careless, when health care workers start to get infected and how something like this starts to spread. here's a very important number. 42. 42 days, that's two incubation periods. if you get to 42 days with no new cases, that's when people will say okay this outbreak is over. they got to scour the entire country, the surrounding areas, and make sure there are no new cases, and then it's time to pack it up. still ahead, i'm going to show you how my crew and i stay safe reporting on a story like this one. we'll give you an exclusive look inside what we call our go bag. >>> up next