From the article linked in the 2nd post:
When he returned to Hong Kong, Mike had developed a lung infection as was revealed by a CT scan, MRI and X-ray.
He believed that he caught this from accidentally swallowing dirty lake water or had acquired it from the concussion.
After being hospitalised for three days in his home town, his medical costs had racked up to a hefty £5230 - but luckily for him, he had taken out travel insurance and wasn't lumped with the extortionate bill.