I'm thinking down the line they could put more than the 3-4 strains in the vaccine that are in the current ones (Moderna is aiming for four right now, which is

I'm thinking down the line they could put more than the 3-4 strains in the vaccine that are in the current ones (Moderna is aiming for four right now, which is what the other "industry leaders" do). But I am not an expert, at all.