24 March 2021. Vietnam called for urgent diversification of its sources for COVID-19 vaccines amid global supply problems, as the Southeast Asian country pushes forward with an inoculation program that began earlier this month.https://www.reuters.com/article/us-health-coronavirus-vietnam/vietnam-seeks-to-diversify-covid-19-vaccine-sources-amid-supply-issues-idUSKBN2BG1ZW