So there are parts of the body the immune system cant go, like the gonads, and eyes, the viruses like Ebola can get in there like toxoplasmosis (eye floaters from cat faeces) and then you become a carrier. Men can pass on Ebola through semen which was being seen in Africa not so long ago and yet still test negative for Ebola!
And then there is global warming like the Artic permafrost thawing that has the potential to release long since forgotten threats. https://www.esa.int/Applications/Observing_the_Earth/Permafr...
So with increased numbers of people travelling and the global population going up, the risks keep going up so I'm not surprised WHO want to take control of this globally. At least they issued a directorate to reduce the number of cycles a PCR test goes through. Putting aside somewhere between 80 and 85 different PCR testing machines, which are not standardised, some countries were only using a cycle threshold of 18 whilst others were using a higher cycle threshold of 45. The cycle threshold can be likened to microscope magnifications, at some point the fluorescence of past viral debris will show up like a live virus the higher the cycle threshold goes.
Now with out this WHO directorate, you would probably be seeing more lockdowns in some parts of the world and other parts spreading Covid like wildfire. Sure its hard to argue things could have been better or worst when we cant jump into parallel universes, but COVID isnt over yet and monkeypox could trigger more lockdowns.
It also shows that countries need global guidance.