The is from Michael Osterholm's Group at the University of Minnesota.  "A new study from China showed that antibodies faded quickly in both asymptomatic and symptomatic COVID-19 patients during convalescence, raising questions about whether the illness leads to any lasting immunity to the virus afterward.”

This raises a question of whether there may be a lasting immunity and that includes herd immunity.

"In this episode, Dr. Osterholm and host Chris Dall discuss whether the US is nearing an apex in COVID-19 cases, what it may look like to “reopen” the country, a reality check regarding widespread testing, and what to make of the constant stream of new information and research findings."

This is a worthwhile 38-minute audio. Highly Recommended.