It has been only 101 days since a cluster of cases of pneumonia in Wuhan, China, were reported to the World Health Organization, and already our understanding of the deadly COVID-19 pandemic seems extraordinary. But even with over 1.6 million people infected worldwide it’s unclear whether recovery will make patients immune going forward.

“The canvas that we call COVID-19 was absolutely blank [at the start], it’s so remarkable, inside this many weeks, you think of how many pixels we put on that canvas, it is astounding,” said Dr. Gregory Poland, director of Mayo Clinic’s Vaccine Research Group. “However, there are a lot of blanks on that canvas — immunity and reinfection is one of those.”

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