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It also looks like Pfizer is developing a delta specific version of the vaccine, could this indicate that the virus is close to evolving into an entirely new virus rather than just a new strain?
No. The media have been mixing the terms variant and strain a lot (to which I had also been guilty). But there have not been any new officially recognized strains diverging from SARS-CoV-2 yet. That could happen eventually, but for now there are just many (and really, many)
variants, which are basically just mutations that affect how the virus performs the same functions, like being a bit better at invading a cell. Most variants don't become a problem and don't even make the news. But a few like alpha and especially delta are much more transmissible, or reduce the efficacy of current vaccines, and thus become a concern.Understanding virus isolates, variants, and strains (virology.ws)Since all these variants are not sufficiently different in phenotype, they're still all considered the same strain of the virus. But the reduced efficacy of vaccines to them is why we will be needing boosters.