The age group of preschoolers & school agers are most at risk for trauma due to abuse, asthma, fluid imbalance due to gastroenteritis, and injury related to falls.
It is usually caused by a bacterial or viral tummy bug, which is probably found in preschoolers/schoolers of early age. In children cases are caused by a virus called rotavirus.
It is so because where in early age humans have a strong immune system but also in this age they are just developing it (in this age the immunity building system processes), which is why they are prone to diseases and other infections.
To learn more about gastroenteritis here
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