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I suppose you’re right, unless one or more of the “vaccines” are less effective against a particular variant. Data out of Israel and the UK isn’t very encouraging (Pfizer and AstraZeneca, respectively) against Delta variant. Still seems somewhat effective but not as robust nor lasting. Israel says Pfizer is only 39% effective but still reduces serious illness by around 90% or so. AZ vaccine seems the weakest (compared to the 3 we have here, not sure about Russian/Indian vaccines) but the UK/EU had to take what was available at the time.

I read that in the UK, 40% of hospitalizations are among double-jabbed with the AZ vaccine... not good.

Yeah, there is little doubt the Indian (delta) variant is challenging the vaccines. Hopefully, it will peak and decline as quickly as it did in the UK. A lot of cases are coming, hopefully with a lot less loss of life. This relative risk by age chart from the UK is important especially in light of the high 65-year-old vaccine rate in the US: Chart showing that vaccines have made Covid-19 far less lethal. A fully-vaccinated 80-year-old now has the same mortality risk as an unvaccinated 50-year-old

Chart showing that vaccines have made Covid-19 far less lethal. A fully-vaccinated 80-year-old now has the same mortality risk as an unvaccinated 50-year-old