That's one thing most people don't know about virus and why it is dangerous, it mutates. The more it spreads, the more it mutates. Sometimes when it mutates, it becomes stronger. Sometimes it becomes weaker. Though I may not be right, but I think the reason we have a lot less cases and deaths in Asia (with the exception of China) than in the West was because the strains of Covid-19 here are a lot less lethal in the West just because here in Asia, most countries already started doing something against it early on back in January once they saw what was happening in China. By reducing the spread early on, the strains of the Covid-19 coronavirus here were not able to transform into a deadlier strain that we see in the Western world. Another reason for less deaths here in Asia is maybe because the people here are just healthier than the people out in the West. Anyhow this is just my theory. I am not saying it is a proven fact.