It is reported that the percentage of delta infections that have been confirmed in the country is 42%.
‘Our world in data’ Global corona data analysis shows this.

This suggests that even countries with advanced medical treatment, such as the United States and the United Kingdom, have not survived the deadly Delta strain of the Covid-19 virus that is engulfing the world.
Of the total Kovid infections in Sri Lanka, Delta infections are identified only on the basis of samples and limited methods, so the actual values are likely to be much higher.