Causes and Treatments of Diarrhea

A child has had diarrhea for three days, accompanied by vomiting, no fever. Vomited after taking medicine. The child is not feeling well, and vomiting continues even after medication. The child ate a lychee and a small amount of Activia yogurt in the morning before the diarrhea started. Everything the child has eaten since then has been vomited, except water. No fever for three days. Now the child is not feeling well, and vomiting continues even after taking medication. Is it a food issue or caused by a virus infection?
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