Armed with positive antibody tests for Covid-19 and a history of related symptoms, some Americans think they had the disease as early as fall 2019.

Last November, New Jersey dental hygienist Judy Abram suffered a severe illness that left her gasping for air. She tested positive for antibodies to the new coronavirus last month. “They just have the timeline wrong somewhere, which explains why we’re so deep in it,” she said. “I felt so strongly. I would’ve questioned if the test came back negative.”

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