erm...no! i am a nurse and had gastroenteritis. all you need is a return to work certificate from your doctor (the other end of the sick note with a date to return to work) to be classed as ready to go back. never in my life have i heard such crap (pardon the pun!) - if it was c-diff or mrsa i could understand it, but gastroenteritis normally lasts for 2-6 days, so 10 days is enough for recovery and to be clear of symptoms. the rule of thumb in healthcare is that if you have had any diarrhoea and vomiting illness, you must be clear of symptoms for 48 hours before returning to work. i would never start talking stool samples with my employer (unless i had a notifiable disease - which this is not) and would tell them to get stuffed, that i had done what i had to do in order to return to work and would sit on my bum at home until they stopped being stupid. your daughter should be a member of a union anyway (for indemnity purposes) and if she is, i would give them a call to fight her corner. they are being completely ridiculous! x