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Why aren't there more than 60 strains of influenza (if its thousands of years old) ?
I'm talking about strains of influenza, and NOT the 4 'types' (A, B, C & D).
i read somewhere that there are about 60 strains, and that there are new variants popping up every few years.
if that's the case, why are there only 60 strains ? surely there would be hundreds or thousands ?? Flu has been around for thousands of years, so surely there will be much more than just 60 strains ? (especially if there are new variations popping up every few years)
EXTRA QUESTION:
How many strains of coronavirus are there ?
is it true that coronavirus has been around for only 60 years? or is it way earlier than this ?
1 Answer
- CarolOklaLv 71 year ago
Onlyv60 strains have survived is why. The others hsve gone extinct. It mutates pretty rapidly as well. Survival of the fittest. Proof that evolution really DOES happen.
