This graph makes it quite clear that Japan is hiding their numbers (also Iran and South Korea):
https://aatishb.com/covidtrends/?country=Australia&country=C...
The Graph also shows that China either has a cure, or is fuzzing their numbers as well.
https://www.bloomberg.com/news/articles/2020-03-24/china-s-h...
I decline. It might be what coopsmgoops suggests, or it may be something else. I don't posess the facts and therefore I won't speculate on matters of public health.
But if it's a real difference, the possibility of genetic resistance ought to be explored. It's not that it would likely make any practical difference. But it would at least be interesting, and one never knows.
Yet they stick to each other like sardines in a can when they take public transport every single day in Tokyo and Osaka - and we are talking about dozens of millions of people who transit every single day. That should be the primary mode of exposure especially since masks have completely run out in Japan for months.
So, unlikely to be a good explanation, sorry.
Tangental note, but this caught my eye. It's exactly the kind of comment I would expect to hear in a movie about a global disaster. "I hear Japan is hiding their numbers", "I hear China has a secret cure", "I hear Missouri is untouched by all of this", "I hear..."
I would appreciate it if we avoided this kind of hearsay on HN during these difficult times.