Novovirus is no laughing matter.
As Nigel11 points out, the elderly are particularly vulnerable to Novovirus, and it spreads very, very quickly through vulnerable populations in hospital or aged care facilities. I've seen hospital wards have to be strictly quarantined over a Novovirus outbreak. That means that people who need care have to wait while all available resources go into fighting the outbreak and looking after the sick before they get too dehydrated. And it's not glamorous work.