I'm going to bet that even with insurance, that's an incredibly hefty bill (the dark side of illness in the US that many COVID deniers will face in future - even a short hospital stay is expensive).
For example, most people have a deductible (which can be as large as $20,000 for the family). For those of us with really good insurance, it can still be $2000-5000. Then, in my case, I have to pay 20% of the remainder (unless I'm in network - which my care, right now, actually is - but not everyone has that worked out).
The air transport, etc, will add a lot to their bill as well. And the child is still vulnerable to tetanus, lifelong. As well as whooping cough and diphtheria.