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^ What one primarily understands from that graph is that our wonderful vaccines' wonderfulness only lasts three months before attaining the level of efficacy that is derired in other vaccines, from the Chinese, or from whoever is not Magic Big Pharma.
Not exactly. The studies were looking at nasopharyngeal (nose-throat) swab positivity. It's measuring viral load and not specifying whether the person had symptoms or whether they had an effective immune response. In the US, we're seeing people with no symptoms or vague "cold" symptoms and it's not until they get tested that we know they have COVID-19. It's still the pattern that 90% of the people presenting to emergency departments with severe symptoms are not vaccinated.
In a good year, the traditional flu vaccines are 40-60% effective. The mumps vaccine is about 80% effective. The COVID-19 vaccines are in line with other vaccines and the 80-95% effectiveness seen in the first 2 months after initial dosing is above average.
Delta has really changed the game. The assumption was that if 70-80% of the eligible people got the shot, then we would see a return to normalcy. That's where we were in the May-June timeframe in the US. Delta has a viral load that can be up to 1,000 times greater than the original strain from 2020. When you're talking that high of a viral load an an R[sub]0[/sub] of between 5-7, then having 60% effectiveness with only 50% of the population immunized, then you're likely to see smaller peaks of infection with those who didn't get vaccinated very likely to get infected.
As long as we have a large number of unvaccinated people (in the US, the estimates are 90 million people unvaccinated), we're going to have to keep antibody levels high to prevent symptomatic illness.

