By Stephen M. Tourjee April 20, 2021Reprints Adobe When I was vaccinated against Covid-19, I felt a deep sense of relief: no more worries about personally catching the disease. So when I noticed mild, Covid-19-like symptoms two months later — stuffy nose, chest congestion, and an upset stomach — I thought they were due to seasonal allergies. I was shocked a few days later when a test for Covid-19 done in preparation for an unrelated medical procedure came back positive. Not believing the result, I got tested again. And again. Over a five-day period I had four PCR tests — two were positive, two were inconclusive — and a false negative rapid antigen test.