An NBC investigation into Covid-19 vaccine wastage in the US, finds that since March about 15 millions doses have been thrown out - that's more than some developing nations have been able to administer.
This has also become an issue in developed nations who are well into their vaccination campaigns, it's estimated between 1 and 4 per cent of COVID-19 vaccines are wasted.
Center for Global Development expert on health-care supply chains Prashant Yadav spoke to Corin Dann.
