How long before food poisoning symptoms show up?

[ashtonfarell]

My friend has just eaten some frozen food that was apparently defrosted by mistake and left in the freezer overnight and then turned back on, so the food was then re-frozen. She's just eaten it and is panicking in case she gets food poisoning. How long before symptoms should show up? What can she do if she starts vomiting, etc?
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[markB]

Hi

It happens pretty quickly often within an hour or so after eating.

Meat, of course, is the source of most cases of food poisoning.

MarkB