It actually seems like omicron was extant prior to the Wuhan strain from a cladistic analysis. It just wasn't prolific. Either way- the boosters target the ancestral spike protein, just like the original vax. There is no difference. So the boosters existed from the moment the vaccines were created. Which is why they are losing efficacy- each variant is more different from the last.
It actually seems like omicron was extant prior to the Wuhan strain from a cladistic analysis. It just wasn't prolific. Either way- the boosters target the ancestral spike protein, just like the original vax. There is no difference. So the boosters existed from the moment the vaccines were created. Which is why they are losing efficacy- each variant is more different from the last.