Adverse reactions in COVID-19 vaccine trial illustrates rocky road to developing therapies for diverse populations

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Patients in clinical trials are usually faceless. But as the experimental Covid-19 vaccine being developed by Moderna Therapeutics has begun advancing through studies, it has found a much more visible advocate: trial volunteer Ian Haydon, a 29-year-old in Seattle.

Haydon has spoken about the vaccine on CNN and CNBC. …

Twelve hours after receiving his second dose, he developed a fever of more than 103 degrees, sought medical attention, and, after being released from an urgent care facility, fainted in his home. He recovered within a day.

He has not brought up the side effects previously, he said, out of “an abundance of caution.”

Related article:  $10 COVID saliva test with results in three hours approved for rollout

But he decided to speak now because he hopes his story counterbalances the desperation that some people feel to push a vaccine to market regardless of the consequences. Haydon points out that the whole purpose of the study he was in, known as a Phase 1 clinical trial, is to find the right dose of the vaccine going forward.

Such side effects are “noteworthy, but it doesn’t stop the train,” said William Schaffner, a professor of preventive medicine and infectious diseases at Vanderbilt University Medical Center. The goal of studies is to establish a threshold at which something might go wrong.

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