I think with swine flu it soon became apparent that it wasn’t as serious as we initially feared it could be. Unfortunately we can’t say the same for Covid.
Yes, I think initially it was thought that it might be as serious as the bird flu virus, which had a 60% mortality rate, as they had feared that it would mutate and transmit from human to human, which never happened. But then they soon worked out that it was much less of a risk.
The code names were very similar, I recall, I think it was H5N4 (bird flu) and H5N1 (swine flu). I think by the time that had been clarified, the media had whipped up a frenzy of panic.