A man from Nevada and a man in Virginia experienced second bouts of COVID-19 about 2 months after they tested positive the first time. Gene tests show both men had two slightly different strains of the virus, suggesting they caught the infection twice.
, and diarrhea. They sent him home. Five days later, he went to the doctor again, this time with difficulty breathing and low blood oxygen. They told him to go to the ER. He was admitted to the hospital on June 5. Lung X-rays showed telltale patches of cloudiness, known as ground-glass opacities, and a nasal swab test confirmed COVID-19.
Researchers stress they can’t be 100% sure these men were. There are other possibilities, including that the virus somehow went silent in his body for a few weeks and then became active again. The study authors think this is unlikely because it would mean that the virus is changing at a much faster pace than has been seen so far.
Scientists are racing to try to understand all those things and more -- what reinfection means and how common it may be. If it happens frequently, that could complicate efforts to reach a level of community protection known as
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