Pfizer COVID-19 Vaccine Effectiveness Drops After Six Months – New Study
A study has revealed that the effectiveness of the Pfizer/BioNTech SE vaccine drops in preventing infection by the coronavirus to 47% from 88% six months after the second dose, Reuters reports.
This was disclosed according to data published on Monday that the United States health agencies considered when taking decisions on the need for booster shots.
The data, which was published in the Lancet medical journal, had been previously issued in August ahead of peer review.
Also, the vaccine's effectiveness showed that the vaccine's effectiveness in preventing hospitalisation and death remained high at 90% for at least six months, even against the highly contagious Delta variant of the coronavirus.
The data suggests that the drop is due to decreasing efficacy, rather than more conta...