Effective vaccines against Covid-19 have been developed in record time, with money from governments as well as the private sector. But more than three-quarters of the 5.5 billion Covid-19 shots administered worldwide have gone to high and upper-middle income countries, while poorer ones have been left behind.

The WHO's COVAX scheme was supposed to ensure equitable access for all countries. But it has repeatedly had to revise down its targets because of supply problems. 

What do you think? Are you concerned about vaccine nationalism? What should be done to get more Covid vaccines, as well as drugs, diagnostics and equipment, to poorer countries? Let us know what you think by joining the conversation below.