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It's probably temporary as it is basically being listed as a symptom.

The significance here is that it may be a symptom of infection in those who are otherwise asymptomatic. Thus it potentially serves as a quick and dirty test for who should err on the side of self isolating even if they don't feel sick to try to stop the spread.

In my case, full loss was temporary, but the reduction permanent and still lasting to this day several years later

Maybe it will be different for covid?

I am no expert but I believe that when caused by an infection it is usually temporary.

The virus only existed since ~November or December last year. There's no way anyone could reasonably tell you if its temporary or permanent.

If most of the people that noted the loss from the infection also reported that they got it back, that would be decent evidence that it was temporary.