The big story this week is that there is now documented proof that a person can be reinfected with the coronavirus. Until this point, people who recovered and then got sick again were thought to have not fully cleared the virus from their body in the first place. Or if they were positive, then tested negative, and then tested positive again, maybe the middle test was a false negative (why some places require two negative tests to confirm recovery).
This patient, in Hong Kong, tested positive in March. Then four months later, picked up a different strain while traveling in Spain, and has tested positive again. However, they have no symptoms this time, which means their immune system is working as intended! And also .. this is only one confirmed case. It might be very rare that this even happens.
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