Is the Moderna Vaccine More Effective Than the Pfizer-BioNTech Vaccine?

“Breakthrough” COVID-19 cases are less likely to occur among those who received the Moderna COVID-19 mRNA vaccine when compared to recipients of the Pfizer-BioNTech mRNA vaccine as per a study at the Case Western Reserve University, published in the Journal of the American Medical Association.

A vaccine breakthrough infection occurs when a person becomes infected after being fully vaccinated (receiving two doses of the mRNA vaccine), according to the Centers for Disease Control and Prevention.

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‘People who received the Moderna vaccine were less likely to be hospitalized, compared to recipients of the Pfizer-BioNTech vaccine. ’

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The study examines breakthrough SARS-CoV-2 infections, hospitalizations, and death rates when the Delta variant was predominant.

Rong Xu, professor of bioinformatics and director of the Center for AI in Drug Discovery at the Case Western Reserve School of Medicine and study author, said the study analyzed electronic health records of more than 637,000 fully vaccinated patients from 63 healthcare organizations across the United States, covering diverse geographic, age, races and ethnicities, income levels and insurance groups.

“Breakthrough COVID infections, hospitalization and mortality associated with the Delta variant were compared between recipients of Moderna mRNA vaccine and recipient of Pfizer mRNA vaccine while considering patient characteristics and the varying time since vaccination,” Xu said.

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Data included COVID-19 breakthrough infections that occurred between July and November 2021, when Delta accounted for almost all cases. Incidents of breakthrough infections were included if the person had not been previously infected with COVID-19 or had received a booster vaccination.

The team considered demographics, social determinants of health, transplants, and comorbidities. Hospitalization rates of patients within 60 days after COVID-19 infection were also compared.

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The findings show that the monthly incidence rate of breakthrough cases was higher in those who received the Pfizer–BioNTech vaccine, compared to the Moderna vaccine.

For example, the data showed 2.8 breakthrough cases in those vaccinated with Pfizer–BioNTech, compared to 1.6 cases per 1,000 people in November 2021. The 60-day hospitalization rate was 12.7% for Moderna recipients and 13.3% for Pfizer–BioNTech recipients.

No significant difference was observed in mortality rates between those who received the Moderna vaccine and Pfizer- BioNTech vaccine.

“Although there is a difference in breakthrough infections, both vaccines are highly protective against SARS-COV2 infection and especially against the most severe consequences of infection,” said Pamela B. Davis, the Arline and Curtis Garvin research professor in the center for community health integration and a coauthor of the study. “Further studies are required to assess the results of booster doses and also the protection afforded especially vulnerable populations by vaccines.”

Source-Eurekalert