Delta Variant Reduces Pfizer and Moderna Vaccine Efficacy to 66%, CDC Study Finds

The data on the decline in the effectiveness of the Pfizer and Moderna vaccines has been confirmed by a study conducted in the United States. This data comes from a study conducted on thousands of employees of care centers and hospitals who received the Pfizer or Moderna serums in six states.

Between December 2020 and April 2021, the vaccine efficacy for preventing infection was 91%. But since the Delta variant has become dominant, the efficacy of these two vaccines has dropped to 66%. "Although these interim data suggest a moderate reduction in vaccine effectiveness against Covid-19 infection, the fact that the reduction in infections remains two-thirds underscores the continued importance and benefit of vaccination," the authors of this study warn.

Due to this drop in efficacy observed in several studies, the US authorities have announced a recall campaign starting in mid-September. Adults who received their second dose eight months earlier are affected by this booster dose.

What will Morocco do, which received nearly 900,000 doses of the Pfizer vaccine a few days ago? Perhaps this study will hasten the third dose for which some experts and specialists are advocating and which is the subject of consultation. Another study published on Tuesday by the CDC indicated that unvaccinated people were 29 times more likely to be hospitalized than vaccinated people.