Sorry I guess my question wasn't clear. I meant to ask, what is the source that those hygiene practices he mentioned are factors in the lower rates of spread of the virus given that other countries such as Italy and Spain have enacted stricter measures and yet show higher rates of spread? I am not asking for sources to show the difference in cultural practices.
I have no source for that, and it was a guess/suggestion for your original question, that maybe because preventive measures were already in place in the culture, they may have slowed the spread before proactive measures were taken.
