This is not a reasonable conclusion. We had SmallPox on earth for 3,000 years and it was not mutating. If 30,000 people die from the Flu in the US and you assume it has a mortality rate of 0.1% then only 30 million got it. That is 1/12th of the US population. The same holds true of all other countries. Since the flu is a virus that is carried by birds we can get the flu from chickens or geese, or any other migrating bird so of course there can be a variety of strains. So if you just have 3 primary strains it means only 1/36th of the US population contracts any one of these strains in any given year. To make things worse the strains mutate. So even if I get the flu one year and that gives me pretty good protection the next year, with each passing year and all the mutations that protection will wane.
Two variants of C-19 have come from there as well (beta and Delta).
India relies upon "natural immunity" more than most countries.