Actually, never underestimate how much a minor illness can cost.
Indeed, for pediatric diarrhea, a few thousand bucks might not seem like much, but when you multiply that by a large population base...
It becomes a national burden!
As more and more pediatric diarrhea patients appear in Yue Country, the massive population base and evidently unequal medical resources are clashing, becoming a significant factor threatening social harmony and stability!
Perhaps not to the point of threatening social stability and public order like other infectious diseases later on.
Because rotavirus really bullies the weak and fears the strong; it does not stand a chance against adults, only bullying children.
A large number of diarrhea patients continue with rehydration fluids, yet many rural and mountain areas are ironically lacking sufficient quantities of these fluids.
