Moderna vaccine more effective than Pfizer’s in the long term, according to US study

According to a study published by a US health agency, Pfizer’s serum is 77% effective against severe forms of Covid-19 beyond 120 days after the injection, against 92% for that of Moderna.

Moderna’s vaccine offers better long-term protection against the serious effects of Covid-19, compared to that of Pfizer, concludes a study published on September 17 by the main health agency of the United States.

Moderna 92% effective after 120 days, compared to 77% for Pfizer

Researchers from the Centers for Disease Prevention and Control (CDC) analyzed a sample of nearly 3,700 adults hospitalized for Covid-19 associated with severe symptoms, between March 11 and August 15, 2021, a period of which precedes and includes the predominance of the Delta variant.

Over this period, Moderna’s vaccine was 93% effective against hospitalizations, Pfizer’s vaccine 88% effective and Johnson & Johnson’s vaccine was 68% effective.

Particularly noticeable is the loss of effectiveness of Pfizer’s vaccine over time: its effectiveness rate drops from 91% over the period 14 to 120 days after injection to 77% for the period after 120 days.

In comparison, over the same periods, the effectiveness rate of Moderna’s vaccine increased from 93% to 92%.

Several recent studies point in the same direction, confirming the apparent superiority of Moderna’s vaccine over that of Pfizer.

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