Study: Pfizer Provides Adults with 90% Protection against Delta

A recently published study showed Pfizer COVID-19 vaccine's ability to give adults 90% protection against Delta variant, Al Ain reported on Thursday.

The study also expressed that the vaccine's percentage of perfection against Delta variant symptoms is 93%.

It was published in the New England Journal of Medicine, and it was conducted between June 8, to September 11.

On the other hand, Data collected by US scientists showed that the effectiveness of the Pfizer / Biontech anti-coronavirus vaccine decreased to 47% from 88% within six months after the second dose.

The researchers of US health agencies relied on this data when they decided to grant booster doses of the vaccine to sustain the immunity of the human body.

The data, published on Monday in the Lancet Medical Journal, stated that the analysis of data on the effectiveness of the vaccine in preventing symptoms that require hospitalization, or that lead to death as a result of COVId-19, showed that it continues to be effective by 90 percent for at least six months, even in the face of a mutant Delta which is spreading fast, according to Reuters.

Researchers said that the reason is that its effectiveness declines as time is passed, and not in confronting strains of the deadly virus that are more capable of spreading the original one.

The data show that the effectiveness of the vaccine against the Delta mutant was 93 percent after the first month and then decreased to 53 percent after four months.

In the face of other mutations of the Coronavirus, the effectiveness decreased to 67 percent from 97 percent.