Japanese retail investors will have another chance to invest in popular South African rand-demoninated uridashi bonds in March, but these ones will have an ethical twist. (Uridashis are bonds sold to Japanese retail customers in denominations other than yen.)

The finance arm for the Gavi Alliance, a non-profit organisation with donors including the Bill and Melinda Gates Foundation, will next month issue a R1.4bn (£93m, $184.5m, €121m) bond in Japan, and use the proceeds to immunise children living in impoverished communities all over the world as well as provide basic infrastructure to administer the vaccines efficiently.