A nap. It's no more than a nuisance if you're in shape.
I just ran a fever a couple of days ago. Took an emergency pack drank a lot of water and went to bed a few hours early. Felt fine the next day.
When I had Covid I ran three miles on my worst day of symptoms. Felt like I was 4-5000' higher in elevation with a cold. The decreased oxygen levels were a distinct symptom, but unless you're a ham who dies from cardio in the mountains then it's no big deal.
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