Covid vaccine

[sally]

I can start listing multiple reasons. Here is just one. Covid variants have been around forever which is why the the vaccine came out so fast so they say. Ok. But if they all spread the same, why didn't they know how it spreads for months? So it's a novel virus as far as how it is spread, but not for developing a vaccine? Then all of the sudden they figured out millions are walking around asymptomatic infecting everyone else. It's a new weird virus where you can be sick and not even know, but a vaccine has been in the making for years.