I haven't heard of SV for a LONG time down here in Australia. My mom works at the hospital as I might have mentioned and I asked her, she said she hadn't seen any outbreaks or even 1 case of sv (I assume norwalk virus is another name for it, because thats what she kept calling it) at all, then again, she hasn't been here her whole life, only the past 6 years but still, before then, she heard of only 1 case