6yr old threw up 5 times at night duringday has fever of 37 4 c to 37 1 with occasional stomachache low apetite but no more vomiting 2 is it a virus?

Probably a virus. Assuming the child has been healthy in the past and not on antibiotics for a long time, this is likely to be a virus. Giving mostly clear liquids, in small volumes frequently, will keep him/her hydrated. Don't worry about the decreased appetite and low-grade fever. If it is not better after 3-5 days overall, call the child's doctor for more specific advice.

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6yr old threw up 5 times at night duringday has fever of 37.4 c to 37.1 with occasional stomachache low apetite but no more vomiting #2 is good virus?

Seems stable. There are stomach viruses, or enteroviruses, going around that can cause vomiting, diarrhea and fever. If the fever is fairly low grade as you describe, with no more vomiting and they can keep down some fluids, then you are probably ok. Watch for excessive diarrhea, return of vomiting and signs of dehydration, and call your doc if those occur.