Is it true that two participants died as a result of “serious adverse events” from an experimental COVID-19 vaccine?

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There were two deaths among the 21,000 people in the trial who received Pfizer and BioNtech’s COVID-19 vaccine, but the U.S. Food and Drug Administration did not attribute those deaths to the vaccine.

According to a December 2020 FDA document describing the circumstances of the deaths, “one experienced a cardiac arrest 62 days after vaccination #2 and died 3 days later, and the other died from arteriosclerosis 3 days after vaccination #1.” The document also said in the case of the second death, the participant had “baseline obesity and pre-existing atherosclerosis,” or a narrowing of the arteries.

There were also four deaths reported among the 21,000 trial participants who received a placebo. The deaths “represent events that occur in the general population of the age groups where they occurred, at a similar rate,” according to the FDA document.

To determine the safety of the vaccine, the trial recorded what are called “serious adverse events,” defined by the U.S. National Library of Medicine as any medical event that results in death, hospitalization, or interferes substantially with normal life functions. The FDA document said among the serious events reported in the Pfizer/BioNTech trial, it considered only two as possibly related to the vaccine: a shoulder injury and swollen lymph nodes, a common and typically benign condition.