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It takes a lot of people to develop a COVID-19 vaccine. Volunteers may be one of the most important.

Wochit

Recent pauses to two large-scale COVID-19 vaccine trials and a treatment study should reassure people — not frighten them — vaccine experts said, though it is a reminder of the messiness of science.

“This is an indication that the system is working as it was designed to work to protect human subjects in clinical trials,” Lawrence Gostin, a public health and legal expert at Georgetown and Johns Hopkins universities, said Tuesday. “It demonstrates that the ethical guard rails on vaccine trials are working.”

It’s not unusual for late-stage trials of drugs and vaccines to be stopped briefly to examine safety concerns, he and others said.

The discovery of an adverse event and a pause in the clinical trial is actually reassuring, said Dr. Bali Pulendran, a professor of immunology