Research shows that Pfizer’s effectiveness is halved in half a year

The Pfizer Inc / BioNTech vaccine’s effectiveness in preventing COVID-19 infection drops to 47% from 88% six months after the second dose.

Research shows that Pfizer's effectiveness is halved in half a year

This is evidenced by data published in the medical journal Lancet, writes Reuters.

The analysis showed that the vaccine’s effectiveness in preventing hospitalizations and deaths remained high – 90% – for at least six months, even against the highly contagious “Delta” variant.

The vaccine efficacy against the Delta variant was 93% after the first month, dropping to 53% after four months. Against other variants of the coronavirus, the effectiveness dropped to 67% from 97%.

The data suggest that the decline is associated with decreased efficacy rather than more infectious options.


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