AstraZeneca says its COVID-19 vaccine was 79% effective, had no safety issues in major U.S. trial

AstraZeneca says its vaccine was 79% effective at preventing any COVID-19 symptoms and 100% at preventing severe ones in large-scale U.S. trials, and also had no safety issues with blood clots.

The results of the trials involving 32,449 people, reported Monday, pave the way for the company to request emergency-use authorization in the U.S.

Notably, the company said the vaccine was 80% effective in people 65 and older. Its efficacy was also consistent across ethnicities.

“These findings re-confirm previous results observed in … trials across all adult populations, but it’s exciting to see similar efficacy results in people over 65 for the first time,” Ann Falsey, a professor at the University of Rochester School of Medicine in New York and the co-lead principal investigator for the trial, said. “This analysis validates the AstraZeneca COVID-19 vaccine as a much-needed additional vaccination option.”

The data come after several countries, including Germany and France, halted use of the shots because of reports of fatal blood clots in a very small number of recipients on the continent. The company said that, with the help of an independent neurologist, it specifically examined the U.S. trial data for information regarding blood clots, or thrombosis, and found no safety concerns.

“The vaccine was well-tolerated, and the independent data safety monitoring board (DSMB) identified no safety concerns related to the vaccine,” the company said in a statement, adding: “The DSMB found no increased risk of thrombosis or events characterized by thrombosis among the 21,583 participants receiving at least one dose of the vaccine.

The European Union’s drugs regulator said Thursday that there was no evidence linking the vaccine with an overall increased risk of blood clots, although it could not definitively rule out an association between the shot and the reported incidents. Germany and other countries began resuming use of the vaccine a day later.

“We are confident this vaccine can play an important role in protecting millions of people worldwide against this lethal virus,” senior AstraZeneca executive Mene Pangalos said. “We are preparing to submit these findings to the U.S. Food and Drug Administration and for the rollout of millions of doses across America should the vaccine be granted U.S. emergency-use authorization.”

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