At least, say, for the next 3-5 years.
The emergence of these new coronavirus variants, including in South Africa, really make this point obvious. Why would you invest huge amounts of resources into vaccinating your population against covid, only for the virus to mutate somewhere halfway across the world, then get reimported back into your country? Especially if your current crop of vaccines can’t be guaranteed to work against the mutation. And then there’s always the risk of it mutating into something more virulent or affecting younger people (unlikely but can’t be completely ruled out).
Imagine panicking again and ending up with more lockdowns as the variant takes hold in your country, waiting for another vaccine...
So far we’ve avoided proper border controls in the UK (I mean, even business travellers were recently made exempt from quarantine requirements...) but I can see that changing as the promise of normality - and the threat of further mutations - become clear. Vaccine certificates or strict quarantine, similar to NZ style.
Thoughts?