You said, well, exactly what I quoted, which was that variant-specific vaccines for Delta and Omicron were tried, found less effective than the the existing vaccines, and abandoned. That is false.
> I mentioned the upcoming Omicron vaccine too.
No, you said that after abandoning Delta/Omicron variant-specific vaccines, “they” decided to work on mixed Omicron/Alpha boosters. That is also false. Novavax is planning to trial Omicron-specific vaccine. Pfizer is trialing Omicron specific vaccines, both as sole vaccines and as boosters after existing vaccines. Moderna is, I think, working on an Omicron-specific booster-only (after existing vaccines) approach.
> which was that variant-specific vaccines for Delta and Omicron were tried, found less effective than the the existing vaccines, and abandoned
> It turned out that the original vaccine is as effective for Delta, so that work was shelved. Omicron, on the other hand, seems to be evading the immunity created by the Alpha vaccine, so they are actually planning to start producing an Omicron specific booster (or more correctly Alpha+Omicron) after FDA approval.
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The thing he said may not have been strictly accurate but your claim about what he said is much less accurate than that.
I said "for Delta". If you read the rest of my comment I mentioned the upcoming Omicron vaccine too.