... somebody was asymptomaticly infected and somehow a test missed it. Mystery solved. Happens all the time.
But the point is that all these measures they took saved probably one of their lives and likely saved all of their lungs, heart, and liver. And to boot, allowed their science research to continue, nuissanced at worst but not disrupted. If they hadn't done all this, the news report would be much more grim.
So, that would make the vaccines doing their job, now, wouldn't it.