<s>[INST] hi my son was sick about month ago was vomiting for almost a week and it kinda went away then it started 3 days ago again as soon he eats it comes out if it is flu how long does vomiting stays and took him to doctor yesterday and found out that in 2012 when i brought him in for same reason they did stool test but just told me yesterday that hi has parasite so just wondering is it a flu ,parasite or something other then those two [/INST] Hi....mentioning age would have been even more helpful. But one thing parasites/ worm infestation doesn't present with vomiting.This could as well be a prodrome or starting stage of a viral Diarrhea too. Unless the kid's having low urine output or very dull or excessively sleepy or blood in motion or green bilious vomiting...you need not worry. Regards - Dr. Sumanth </s>