F
Freddy
Guest
Each of the strains evolve:Freddy:
It depends on the strain of flu. WHO determines that on an annual basis and identifies the 4 most prevalent strains for that season. Its not really flu evolving.The flu evolves. That’s why you need yearly shots. The ones that you have next year won’t be same ones you had last year. Likewise with covid. One vaccine won’t give you lifetime protection so there’s no permanent solution.
But there are very many procedures that will prevent you getting it this time around.
‘Of all the influenza viruses that routinely circulate and cause illness in people, influenza A(H3N2) viruses tend to change more rapidly, both genetically and antigenically’. Types of Influenza Viruses | CDC.
If they didn’t evolve (change genetically) then a vaccine against one strain this year would always work.