WHO and Estonia have agreed to collaborate on developing a digitally enhanced International Certificate of Vaccination, a “smart yellow card” to help strengthen the effectiveness of the COVAX initiative, which has been established to speed development and equitable access to COVID-19 vaccines.
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https://www.euro.who.int/en/health-topics/health-emergencies/coronavirus-covid-19/news/news/2020/10/estonia-and-who-to-work-together-on-digital-health-and-innovation