New Delhi, Sept. 21 -- The Delta variant with faster infect, more dangerously has made the epidemic prevention achievements of all countries in the world severely affected, including results in vaccination strategy. Countries with the top vaccination rates in the world such as the US and UK increased in infections.

In the wave of Covid-19 caused by Delta variant, developing countries are the hardest hit due to limited health systems and low vaccination rates.

Vietnam is a successful country in the fight against Covid-19 in 2020 and early 2021 with just over 3000 cases and 35 deaths. However, from the end of April to the beginning of May 2021, the number of cases and the mortality also increased rapidly. Over mor than last one month, the...