katie nicholl, thank you very much indeed.ovely to talk to you. >> thank you. >>> i want to bring in cnn's own dr. sanjay gupta to talk about the condition that's caused the duchess to be hospitalized. it's an interesting case. i'm hearing different levels of percentages here, 1 in 50 women, 1 in 200. does it depend on how badly they get this and what exactly is the condition? people call it acute morning sickness or whatever, but it's a bit worse than that, isn't it? >> it is worse than just typical morning sickness. most women get some form of morning sickness but this is much more serious. it is rare, about 2% usually around, piers, is the number. usually not life-threatening. simply, piers, what happens is there's a lot of release of different hormones at the time that someone becomes pregnant, and around eight or nine weeks usually into the pregnancy is when those hormones actually become -- start affecting the nausea centers, if you will, in the brain. i can tell you, it's very profound, meaning that you simply cannot ke

joining me is katie nicholl, correspondent for the mail on sunday.kering, laughing a bit, and it's suddenly become a much more serious, awful tragedy. what do we actually know about this? >> reporter: well, i can sure you, piers, no one is snickering or laughing tonight. this story has taken a turn for the very, very worse. it's incredibly tragic. the news is that jacintha saldanha, the nurse who took the hoax call from those two deejays in australia and transferred it to the ward that catherine was staying on was found dead at her house this morning. she was living in hospital accommodations just down the road from the edward vii hospital. she is the mother of two. we don't have an age for her, we don't know how old her children are. the family have asked that their privacy at this time is respected and all quearies are being referred to the police. we are all deeply shocked. it's a terrible story and a terrible twist that will leave william and catherine absolutely devastated. >> i think everyone involved will be devastated. the two deejays have su