WHYY By Dion MBD for NPR Science writer Robin Marantz Henig has written about dangerous emerging pathogens for 30 years. But none of what she learned could shed light on her own confusing encounter with the coronavirus. When they called to tell me my COVID-19 test was positive, I thought there must have been a mistake. I felt perfectly fine, and in the long months of the pandemic my husband, Jeff, and I had been behaving the way much of the United States had: hyper-vigilant about where we went and who we saw, and careful to follow the recommended public health precautions.