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.