Geoff Brumfiel

The largest U.S. database for detecting events that might be vaccine side-effects is being used by activists to spread disinformation about COVID-19 vaccines.

This week, President Biden directed his intelligence agencies to take another look at whether the coronavirus resulted from a lab accident in China. For many, the announcement felt like a big change, putting what had been a conspiracy theory about the virus's origins back on the table.

The end of this pandemic sometimes gets boiled down to two words: herd immunity. But now, as an academic debate swirls over when or even if America can get to a high enough percentage of people with immunity to reach that goal, some scientists say it's time for the public to stop worrying about it.

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Sayer Ji is a 48-year-old proponent of what he calls natural medicine.

"My parents didn't know about natural medicine, so it really wasn't until I was 17 that I learned some basic principles of nutrition and self care," he told attendees at a recent virtual conference. "I was liberated from needing pharmaceutical medicines."

Ji was also there promoting his website, full of natural remedies and reams of anti-vaccine misinformation. He sells subscriptions for anywhere from $75 to $850 a year.

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