Hello. I have a little cautionary tale for you all called 'The Perils of Not Following the 48 Hour Rule'
Once upon a time, there was a Little Boy aged 3, who woke up very late on saturday night (midnightish) and puked down his pyjama top. Mummy and Daddy dutifully yawned, scrambled out of bed and cleaned it all up, little boy spent the rest of the night in their bed without incident. Lucky Mummy and Daddy 
. It was put down to overeating at Pizza Hut earlier in the day.
On Monday (about 36 hours later) Little Boy and his baby brother and Mummy were invited over to Nanny's for lunch. Also there were Auntie and two cousins and a friend of theirs. It was a very busy lunch and they all went out for a walk afterwards to stop all the boys from killing each other in the house.
Poor Mummy felt worse and worse during the walk, it lasted about an hour and she thought she had overeaten - until the moment she threw up violently into the hedgerow 
Luckily everyone else was a few feet ahead but still, !
She made it back to Nanny's house, made her excuses, bundled Little Boy and Baby Boy into the car and drove home, stopping once on the way to lean out of the car and throw up again 
. She staggered on til Daddy got home from work and between the pair of them, got the boys to bed. Mummy went straight to bed too.
Next day she felt fine but Daddy had been in the loo since 4am puking and the other, he was curled up on the floor with a pillow and a glass of water trying very hard not to move. Poor Daddy. He phoned his father (Grandad) who he works with to cancel work for the day and went to sleep while Mummy did her best to entertain two perfectly well children and keep them out of the house for the day. When she got home Daddy was looking a bit better but had spoken to his mum (Nanny) on the phone to discover that both Nanny and Grandad were also now puking, as were Auntie, Older Cousin and cousin's friend who had been at lunch on monday.
Ooops 
If only we'd stayed away from people for an extra day nobody else would have been sick. At half term. With working parents. And a grandmother who is in remission from throat cancer.
Fucking hell.