How does WHO know that???
WHO: Bigger pandemic than Covid is coming-
[zerohedge.com]
For many years - decades even we have been warned (credibly so IMHO) that eventually a virus or bacteria will come along for which we will have no antidote and no effective means to treat and very few people will have immunity for it. It doesn't necessarily mean that such a disease will be a Corona virus. It could be a kind of virus we've never seen before.