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You’ll have to write to info@cfainstitute.org and request a postponement on medical grounds. You’ll need a letter from your doctor or hospital backing this up and specifically saying that you won’t be able to attend an exam-like setting due to your medical condition.
A question that might come up: If your respiratory allergies are ongoing, surely you are aware of this when you registered for the exam. If you were aware that respiratory allergies would not allow you to travel anywhere during the pandemic, why did you go ahead and register for the exam in the first place?