Pfizer vaccine is questioned, the effective rate against the "Delta" variant has dropped from 94% to 64%

Recently, a mutant strain of new coronary pneumonia called "Delta" has sounded new alarms about the global epidemic.
Compared with the original virus and early mutant strains, the Delta mutation has the strongest transmission power, short incubation period, and disease progression.
Soon, it has now spread to more than 90 countries or regions, making the global epidemic prevention and control more difficult
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Although various localities have introduced corresponding epidemic prevention and control plans, the epidemic situation in some countries is still not optimistic, including Israel, which has the world's highest vaccination rate today
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Recently, a preliminary study by the Israeli Ministry of Health showed that Delta not only has a strong transmission capacity, but also weakens the effect of the vaccine.
The effective rate of the fully vaccinated BioNTech&Pfizer mRNA vaccine against Delta mutant strains has dropped from 94% to 64%!

But some other experts hold different opinions
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The chairman of the Israeli expert group, Ran Balicer, said that 85% of Israeli adults have been vaccinated
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In the context of the global epidemic counterattack, this research has sent a signal to the outside world that with the large-scale spread of the delta mutant virus, the new crown vaccines of all countries will be tested by the mutant strains
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Reference materials:

[1]https:// [2] Xinmin Weekly, Qianzhan.