Long time lurker, first time poster (just created an account!) If you click on the chart, that only represents those who have received one dose. For those who have received both, it is only 1.1%. Furthermore, that large spike in one-dose vaccination rates only represents 11.4% of the population. Vietnam has 97 million residents, most of which are packed into densely populated cities. I lived in Hanoi, Vietnam from 2008 till 2010. It was an amazing city. I love every minute of it, but their infrastructure is terrible. I had to sit on people's laps on the city busses. I can only imagine what they are going through now with the Delta variant given how densely populated much of the country is.