MUKHTAR KARIM LAST week WHO Director Tedros Adhanom railed against ‘vaccine nationalism’, warning that ‘going it alone will perpetuate the economic and health crisis for all’. If history is any guide, he is right: if and when a vaccine is available, its effects will be limited to the world’s richest countries. The fantasy of a vaccine that, almost overnight, can eradicate COVID worldwide, is comforting but unrealistic. The UK and US, two of the richest countries in the world, took almost thirty years to eradicate polio after a vaccine was first produced in the 1950s. It was finally eradicated in…