They lead the world in starting plagues because they eat bats, and they are constantly together with pigs and ducks on their farms. Flu viruses are very able to jump from one species to another, and mutate when that happens, and the petri dish for that is China.
WRT your minuscule infection rate for all of China: first, we are still early in the game. Every disease starts with a single person...but what is important is how many get it after 6 or 12 months. You also seem to be believing the numbers that they are putting out. I know that we have pretty much nothing else to go on, but there is a consensus just about everywhere that China is lying to the entire world about this. Further, if it was such a minuscule percentage, why would they quarantine several hundred million people, and go around with giant machines spreading out massive amounts of disinfectant? Don’t believe their words, look at their actions for what the real truth is. The Chinese leadership is panicked over this thing, and that is because they know something that they have not let the rest of the world know.
I heard on the news this morning that the virus will have run its course by this April.