I am glad that you are home now.
Last summer, I was sat next to a sick child, on a plane. The parents were sat together across the aisle.
I caught the pathogen from them, ended up with a week of vomiting, and then lactose intolerance for 3 months. I cursed the parents many times, over that time.
As an aside, yes, scarlet fever is becoming wide spread again, a high fever that doesn't come down, off their food, and then eventually the rash/strawberry tongue. I've had two friends whose children have had it, and they've had no clue what it was, just carried on as usual.
Lastly, the most recent COVID strains (FLiRT), predicted to have a large summer wave, cause diarrhoea/vomiting, loss of smell, flu-like aches and then a fever/cough, so may present initially as food poisoning.
Not that I think you've had these, but I feel it is good to have the info out there.