Delta variant: effectiveness of Pfizer and Moderna vaccines drops to 66%

A new study confirms that a third dose of vaccine will probably be necessary to fight against Covid. According to data from the Centers for Disease Control and Prevention (CDC), the main US federal public health agency, the efficacy of the Pfizer and Moderna vaccines fell from 91% to 66% in particular because of the emergence of the Delta variant. .

The data collected comes from a study conducted on thousands of employees of health centers and hospitals in several states, including Utah, Florida, Texas and Arizona. Subjects are tested weekly for symptomatic and asymptomatic infections.

Data to be analyzed with care

The authors of this study warn against the lack of data collected over the long term. Thus, this decrease in vaccine efficacy could take place over time, and not just because of the emergence of the Delta variant.

However, the researchers point out that the efficacy of vaccines remains high, especially for severe cases: “While these interim data suggest a moderate reduction in the efficacy of Covid-19 vaccines to prevent infection, so does that the reduction in infections remains by two-thirds underlines the continued importance and benefit of vaccination, ”they said.

Another study released Tuesday by the CDC, conducted on patients in Los Angeles between early May and late July, shows that unvaccinated people are 29 times more likely to be hospitalized than vaccinated people.

Regarding the Johnson & Johnson vaccine, the CDC indicates that it is awaiting more convincing results to definitively recommend a second dose.

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