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by kalms 4921 days ago
Well, it's the recommended method from the Danish Serum Institute (SSI), which resembles the CDC in the United States.

(danish, pdf) http://www.ssi.dk/Smitteberedskab/Infektionshygiejne/Hent%20...

Edit: That one is not specifically for flu, but too avoid infectious diarrhoea. We had a similar one at my job, specifically targeted against viral infections.