Weird question - what does it smell like? There are some conditions which cause diarrhea with no other symptoms and have a distinct smell.
Having said that, if you have been otherwise well and are positive it wasn't gastro last week, I am sure you are not contagious. Diarrhea can be caused by many things including too much fat in the diet, sensitivities to food etc. Have you been on antibiotics recently? But if concerned, speak with your GP who can organise a stool sample...
HTH
MG


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