Researchers from the United States and Canada argue that the vaccine of the American company Moderna is more effective in protecting the human body from coronavirus infection, namely from the Delta strain. 

According to two yet to be peer-reviewed reports on medRxiv on Sunday, the effectiveness of Pfizer’s COVID vaccine decreased significantly last month as the Delta strain spread.

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The study found that the Pfizer vaccine’s effectiveness fell to 42 percent in July, down from 76 percent in early 2021.

During the same time period, the study discovered that Moderna’s vaccine’s effectiveness decreased to 76 percent from 86 percent.

The study enrolled over 50,000 patients from the Mayo Clinic Health System in Minnesota, Iowa, and Wisconsin.

Both vaccines remain effective at preventing COVID-related hospitalizations, according to Dr Venky Soundararajan, the Mayo study’s lead author.

He did, however, suggest that those who received either the Pfizer or Moderna vaccines earlier this year may require a Moderna booster shot soon.

It comes as COVID cases continue to rise, with the US recording 100,000 new cases per day for the first time since February.

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While new cases peaked at 11,000 per day in June, the alarming surge is being fueled by the highly transmissible Delta variant, which first emerged in December in India.

According to the Centers for Disease Control and Prevention, the Delta strain now accounts for approximately 93 percent of new infections in the United States.

Cases are particularly prevalent in southern states, where vaccination rates, according to some experts, are lagging.

According to federal data, Louisiana currently has the highest infection rate in the country, followed by Florida, Arkansas, Mississippi, Alabama, Oklahoma, and Missouri.

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Several states’ officials have stated that spiralling infection rates are rapidly crowding hospital beds and threatening to overwhelm health care systems.

Photo by HAZEM BADER/AFP via Getty Images