Two years ago, Kathy Spencer, a 58-year-old math teacher, motorcycle rider and mother of two, planned to guide middle school students through geometry well into her 70s.
But now Spencer, from Kensington, Conn., is facing the real possibility that long COVID will keep her from ever entering a classroom again. She still needs supplemental oxygen, and has difficulty speaking as a result of the hypoxia, or lack of oxygen reaching her brain. She suffers tremors in her head, arms and legs, which can be triggered by talking, and...